Someday, it may be..

[ska7945]

1．It may someday be worthwhile to try to recover uranium from seawater, but at present this process is prohibitively expensive.
（A）It may someday be worthwhile to try to recover uranium from seawater
（B）Someday, it may be worthwhile to try and recover uranium from seawater
（C）Trying to recover uranium out of seawater may someday be worthwhile
（D）To try for the recovery of uranium out of seawater may someday be worthwhile
（E）Recovering uranium from seawater may be worthwhile to try to do someday

answer A
what is wrong with B? Is A just a better sentence?

[Suyog]

IMO A.

I dont know if I can explain this, but I'll try...

‘To try and recover’ is not correct ..you cannot try and do something
B changes the meaning of the sentence. We have to try to recover; we donot have to recover....

I had also selected B initially

[MBAboy]

1?It may someday be worthwhile to try to recover uranium from seawater, but at present this process is prohibitively expensive.
?A?It may someday be worthwhile to try to recover uranium from seawater
?B?Someday, it may be worthwhile to try and recover uranium from seawater
?C?Trying to recover uranium out of seawater may someday be worthwhile
?D?To try for the recovery of uranium out of seawater may someday be worthwhile
?E?Recovering uranium from seawater may be worthwhile to try to do someday

answer A
what is wrong with B? Is A just a better sentence?

I can understand why B is not the right choice.
How did you eliminate C and E?

[MBAboy]

1?It may someday be worthwhile to try to recover uranium from seawater, but at present this process is prohibitively expensive.
?A?It may someday be worthwhile to try to recover uranium from seawater
?B?Someday, it may be worthwhile to try and recover uranium from seawater
?C?Trying to recover uranium out of seawater may someday be worthwhile
?D?To try for the recovery of uranium out of seawater may someday be worthwhile
?E?Recovering uranium from seawater may be worthwhile to try to do someday

answer A
what is wrong with B? Is A just a better sentence?

I can understand why B is not the right choice.
How did you eliminate C and E?

[NSNguyen]

IMO: E
rest of all acquire word order mistake"someday"

[agganitk]

Can someone please explain why C and D are wrong? It is not crystal clear to me. Second question, Is "THIS" a pronoun ? If the answer is yes, then what (noun, clause ..etc.) can be the antecedent for "THIS" ?

[loveusonu]

Can someone please explain why C and D are wrong? It is not crystal clear to me. Second question, Is "THIS" a pronoun ? If the answer is yes, then what (noun, clause ..etc.) can be the antecedent for "THIS" ?

IDIOM is "try to" so both B and D are INCORRECT

Both C and E are incorrect because of lack of parallelism. The sentence has a parallel structure.

"It may some day....,but at present"

Hope that helps!