Correct option is A
The correct option to fill in the blank is
(a) too.
Explanation: The structure required here is
“too + adjective + to + verb”. The sentence means the correlation was
excessively marginal and therefore
not sufficient to influence policy. Hence, “too marginal to influence” is grammatically correct and contextually precise. (Hindi meaning of “too” in this context:
बहुत ज़्यादा/इतना कि नहीं)
Example: The evidence was
too weak to support the claim.
Explain why other options are incorrect:
·
(b) very: “very marginal to influence” is ungrammatical; “very” doesn’t form the required result structure.
·
(c) so: “so marginal to influence” is incomplete; it would need
“so…that…” (so marginal that it couldn’t influence).
·
(d) as: “as marginal to influence” is incorrect; “as…as” comparison structure is missing.