The correct option is E Contractor
The given data can be summarized as:
P - Dentist - Grandfather of U
Q - Advocate - Mother of U and T
R - Businessman - married to Q
S - Manager - Married to P or Grandmother of U
T - Child of Q - Contractor
U - Philosopher - Grandchild of P and S
From the above data it is quite clear that T is a contractor.