Definition: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Input: Question: The sum of first 45 natural numbers is?

 Option A: 900

 Option B: 1000

 Option C: 1035

 Option D: 1040

 Option E: 1045

Option C