The correct answer is: 5.
The Railway Board is a statutory body under the Ministry of Railways, Government of India. It is responsible for the management and operation of the Indian Railways. The Board consists of a Chairman, a Financial Commissioner, and three Members (Engineering, Mechanical, and Traffic).
Option A is incorrect because the Railway Board has 5 members, not 3.
Option B is incorrect because the Railway Board has 5 members, not 5.
Option C is incorrect because the Railway Board has 5 members, not 4.
Option D is incorrect because the Railway Board has 5 members, not 8.