Answer : 4. "B"
Explanation :

A prefers tea. So, from (iv), the industrialist and D prefer coffee. But, from (iii), B and the journalist prefer coffee. So, B is the industrialist and D is the journalist.

Now, A, C and advocate remain. Clearly, E is the advocate.

The horticulturist is C's brother. It can be only A. C is a physicist.

	A	B	C	D	E
Profession	Horticulturist	Industrialist	Physicist	Journalist	Advocate
Profession	Tea	Coffee	Tea	Coffee	Tea

Hence, B is an industrialist