98. As shown in the figure, the first polygon is "expanded" from an equilateral triangle, with the number of sides denoted as $a_{3}$, the second polygon is "expanded" from a square, with the number of sides denoted as $a_{4}, \cdots \cdots$, and so on. The polygon "expanded" from a regular $n$-sided polygon has the number of sides denoted as $a_{n}(n \geq 3)$, then $\frac{1}{a_{3}}+\frac{1}{a_{4}}+\frac{1}{a_{5}}+\cdots+\frac{1}{a_{n}}=\frac{2014}{6051}$, so $n=(\quad)$.
A. 2014
B. 2015
C. 2016
D. 2017
Answer: C