Answer:
B. because party labels still provide the cheap, shorthand cue so useful to rationally ignorant voters
Step-by-step explanation:
The reason is that, for most ignorant voters who have little or no idea about the candidates vying for electoral position, they make use of party labels; which is often times considered as the main ideology or objective of the party candidates.
To them, it serves as a clue to what they will be getting from the candidates if elected, hence, majority of voters still use parties to guide their voting decision.