Answer:
D) In a General election, Gustavo only votes for candidates in the Democratic Party.
Explanation:
In these situations, the only one that accurately represents voting a "straight ticket"- one based on supporting a candidate solely based on party- is in a General election, Gustavo only votes for candidates in the Democratic Party. Skylar is not necessarily voting a straight ticket because participating in a Primary election, when the choice is already limited to candidates within a party.