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, C is the physicist.