Critical Reasoning

Rats are generally more active than mice. But since gerbils are generally more active than hamsters, it follows that rats are generally more active than hamsters.

Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:
Gerbils are generally more active than rats.
Mice are generally more active than hamsters.
Mice are generally more active than gerbils.
Mice and gerbils are generally equally active.
Rats and gerbils are generally equally active.

Only A must be the answer

I need more detail of how you got the answer. tks!

Taniuca wrote:I need more detail of how you got the answer. tks!

Because A directly contradicts the conclusion

Ok, so here we go

We know three things from the passage,

1. R (rats) > (More active than) M (Mice)
2. G > H

Therefore,

R > H

How can we prove this?

If we know 4 things we can prove this. What are those 4 things?

1. M > H
2. M > G
3. R = G
4. M = G

As per A

If you say that G > R then we don't know where exactly H lands?

H may be more active than R or may be less active.

Hope this helps!!!

Taniuca wrote:I need more detail of how you got the answer. tks!