Step 1: Recall scientific classification.
Each crop has a unique binomial name: wheat is scientifically named Triticum aestivum, which is the most widely cultivated species of wheat.
Step 2: Analyze wrong options.
(A) Vigna mungo – this is black gram.
(B) Cajanus cajan – this is pigeon pea (arhar/tur).
(C) Pisum sativum – this is garden pea.
Step 3: Conclusion.
Thus, the correct botanical name of wheat is Triticum aestivum.