Hi Tommy,
The question is:
The powers and satisfactions of primeval people, though few and meager, were ______ their few and simple desires.
(a) simultaneous with
(b) commensurate with
(c) substantiated by
(d) circumscribed by
(e) restrained by
(f) at par with
I can make out two pairs - (b),(f) and (d),(e). I think both these pairs can be appropriate in this case.
However, the answer given is (b),(f) only. Presumably it has something to do with the word "though"? although I fail to understand the reason behind it.