1
2 2
3 4 3
4 6 6 4
5 8 9 8 5
6 10 12 12 10 6
. . .
. . .
. . .
in the triangle shown, the first diagonal line, 1, 2, 3, 4, begins at 1 and each number after the first is one larger than the previous number. the second diagonal line, 2, 4, 6, 8, begins at 2 and each number after the first is two larger than the previous number. the nth diagonal line begins at n and each number after the first is n larger than the previous number. in which horizontal row does the number 2016 first appear?
(a) 90 (b) 94 (c) 88 (d) 91 (e) 89