Given that Armen and Allen have identical tastes,
a. Armen and Allen will spend equivalent portions of their budgets on higher-quality and lower-quality grapes.
b. Armen will tend to purchase lower-quality grapes, and Allen will tend to purchase higher-quality grapes.
c. Allen will tend to purchase lower-quality grapes, and Armen will tend to purchase higher-quality grapes.
d. Armen and Allen will both purchase either only high-quality grapes or only low quality grapes.