GRE solution:A reading list for a humanities course consists of 10 books, of which 4 are biographies

A reading list for a humanities course consists of 10 books, of which 4 are biographies and the rest are novels. Each student is required to read a selection of 4 books from the list, including 2 or more biographies. How many selections of 4 books satisfy the requirements?

A 90

B 115

C 130

D 144

E 195

GRE bios novels combinatorics,