A short-day vegetable is one that requires a period of darkness longer than its critical photoperiod to initiate flowering. In agricultural classification, crops grown during the winter months (Rabi crops), like the Pea, are typically categorized as short-day or day-neutral plants depending on the specific cultivar.
Step 1: Analyze the options.
(A) Tomato: Generally classified as a day-neutral plant, as it flowers regardless of the length of the day.
(B) Pea: Often categorized as a short-day plant in several agricultural contexts because it thrives and flowers during the shorter days of winter.
(C) Chilli: Typically categorized as day-neutral.
(D) Radish: Generally a long-day plant, meaning it requires more than 12 hours of light to flower.
Step 2: Conclusion.
The Pea is the most suitable choice among the options for a vegetable that prefers or requires shorter daylight durations for its reproductive cycle. Hence, the correct answer is (B).
Final Answer:
\[
\boxed{(B) \, \text{Pea}}
\]