From roughly 1900 to 1960, a strong showing in presidential primaries?

Question

a. enable a candidate to demonstrate popular support, but did not ensure nomination.
b. did not improve a candidate's chances of gaining the nomination.
c. guaranteed a candidate's nomination.
d. guaranteed a candidate's place on the ticket, although sometimes as the vice presidential nominee rather than presidential nominee.
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Answer 1

I agree with A. During those years, candidates were nominated at active conventions where a lot of the action took place behind the scenes.