In a party every person shakes hands with every other person. If there were a total of 120 handshakes in the party then what is the number of persons present in the party ?	Choose the correct option:
A) 15 B) 16 C) 17 D) 18 E) 19

Rationale: "explanation : let the number of persons be n ∴ total handshakes = nc 2 = 120 n ( n - 1 ) / 2 = 120 ∴ n = 16 answer : option b"
Answer: B