A triangular array of 2016 coins has 1 coin in the first row, 2 coins in the second row, 3 coins in the third row, and so on up to N coins in the N th row. What is the sum of the digits of N ?

**Answer Choices**

A. 6

B. 7

C. 8

D. 9

E. 10

A triangular array of 2016 coins has 1 coin in the first row, 2 coins in the second row, 3 coins in the third row, and so on up to N coins in the N th row. What is the sum of the digits of N ?

**Answer Choices**

A. 6

B. 7

C. 8

D. 9

E. 10