Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

Problem: if all 6 are replaced by 9, the algebric sum of all numbers from 1 to 100 ( both inclusive. varies by ,
Options: a. 980, b. 330, c. 660, d. 990, e. 300
b