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

A.enabled 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.

I thank it is (A).

Right.

Thank you!!

Right.

To determine the correct answer, we can analyze the period from roughly 1900 to 1960 and understand the purpose and significance of presidential primaries during that time.

Presidential primaries were introduced as a method for political parties to select their presidential candidates. Prior to this period, party leaders and delegates at party conventions were primarily responsible for nominating candidates.

Based on historical knowledge, we can rule out options C and D. The nomination process during this time did not guarantee a candidate's nomination or guarantee their place on the ticket in any specific capacity. The vice presidential nominee was not necessarily the runner-up in the primaries, as party leaders still played a significant role in the final decision-making process.

Now let's assess options A and B. A strong showing in presidential primaries could indeed allow a candidate to demonstrate popular support, and it often acted as a form of an endorsement by the voters. However, this alone did not ensure the candidate's nomination. The ultimate decision still rested with the party leaders and delegates at the party conventions.

Considering all the information, the correct answer is option A: A strong showing in presidential primaries enabled a candidate to demonstrate popular support but did not ensure nomination.