I would go with C.
Stimulus claims only about an avg prediction but the author makes a conclusion about near future that is wrong.

I would say B.....with out explaining it preassumes thing will happen....

I was confused between B and C
but question says
They say it will take place "an average of once every 100 milllion years..."

I think "because of word "every" we cannot say it is of average frequency...
Means it not just happened once...rather it happens 100 million years according to them

sumanr84 wrote:I would go with C.
Stimulus claims only about an avg prediction but the author makes a conclusion about near future that is wrong.

Could u explain a bit more???

Yeah I think it's C too.

Argument claims that earth is struck on an average of once every 100million years

This could mean that earth was struck once, and then struck again after 199 million years. So that would meant that you have 2 strikes in 200 million years, an average of a strike every 100 million years. That does not necessarily mean that the next strike is going to take place exactly after 100 years. Averages can be quite misleading. The average number in this case, can not be used to draw an accurate prediction of the next strike.

My reasoning goes in similar line as vivek's.

vivek1110 wrote:Yeah I think it's C too.

Argument claims that earth is struck on an average of once every 100million years

This could mean that earth was struck once, and then struck again after 199 million years. So that would meant that you have 2 strikes in 200 million years, an average of a strike every 100 million years. That does not necessarily mean that the next strike is going to take place exactly after 100 years. Averages can be quite misleading. The average number in this case, can not be used to draw an accurate prediction of the next strike.

Thx Vivek,

Good explanation . Actually this is a LSAT one..and I messed it up all time today morning..

OA :C

vivek1110 wrote:Yeah I think it's C too.

Argument claims that earth is struck on an average of once every 100million years

This could mean that earth was struck once, and then struck again after 199 million years. So that would meant that you have 2 strikes in 200 million years, an average of a strike every 100 million years. That does not necessarily mean that the next strike is going to take place exactly after 100 years. Averages can be quite misleading. The average number in this case, can not be used to draw an accurate prediction of the next strike.

i would have agreed with you if there was not word 'every' in it....
From the sentence only(with out any inference),if we go by it meaning in english then
earth is being stuck by it in the interval of every 100 million years.
Take 100 billion years for reference....and if we go with the sentence only it is being stuck "every 100 million years" and has stuck many times already....it doesnt mean that it was stuck only once (last time only)

Otherwise word 'every' should be omitted from there.

I take bath everyday
doesnt mean that i took bath yesterday only....

so,i still dont quite agree with B.....atleast with that explanation....