An amphidiploid between B. nigra and B. campestris is

A. B. napus

B. B. carinata

C. B. juncea

D. N. tomentosa

Answer: Option C

Solution(By Examveda Team)

An amphidiploid between B. nigra and B. campestris is B. juncea.
Brassica juncea is an amphidiploid having in its genetic system the full 20-chromosome A genome (Brassica campestris) and the 16-chromosome B genome (Brassica nigra).
Brassica juncea belongs to the mustard family (Brassicaceae or Cruciferae) and has numerous common names used, e.g., brown mustard, Chinese mustard, or oriental mustard.