The following questions has a group. Find out which one of the given alternatives will be another member of the group or of that class.Carpenter, Plumber, Electrician

The following questions has a group. Find out which one of the given a

1.	The following questions has a group. Find out which one of the given alternatives will be another member of the group or of that class.Carpenter, Plumber, Electrician
A.	Doctor
B.	Blacksmith
C.	Professor
D.	Lawyer
Answer» C. Professor