The sequence is formed by repeating the word "problemsolving" continuously:…

The word "problemsolving" has 14 letters.

To find the 2015th character, divide 2015 by 14:
14 × 143 = 2002, and 2015 − 2002 = 13.

So the 2015th character is the 13th character of the repeating word.

Counting the letters:
p(1), r(2), o(3), b(4), l(5), e(6), m(7), s(8), o(9), l(10), v(11), i(12), n(13), g(14).

Therefore, the 2015th character is n. Hence, Option A is correct.