Sentence Correction (SC) | Re: It may someday be worthwhile to try to recover uranium from

I solved this via parallelism but I think it was luck more than skill. Could any experts see if my reasoning below makessense:

It may someday be worthwhile to try to recover uranium fromseawater ,but at present this process is prohibitivelyexpensive.

In italics: The timing came first in the sentence (at present)
In answer choices, only A and B stated the "timing" (someday) at the start of the sentence. Further reading B, "to try and" is wrong. Hence A.

Any experts able
...

---