[amp_mcq option1=”N is brother of B” option2=”N is brother of M” option3=”N is brother of D” option4=”M is brother of B” correct=”option2″]
The correct answer is (b).
M is brother of N and B is brother of N. This means that N and B are both brothers of M. Therefore, N is brother of M.
The other options are not necessarily true. For example, M is brother of D, but D is not necessarily brother of M.