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: there is a 50 cm line marked at each centimeter and an insect is placed at every centimeter. 9 frogs are trained to jump a constant distance. the first one jumps 2 cm in every leap, the second one jumps 3 cm and so on until the 9 th one jumps 10 cm in every leap and they eat any insect that is available at that spot. if all of them start from start line and finish the entire 50 cm, how many insects were still left after the race was over ?
Options: a. 0, b. 4, c. 6, d. 8, e. 11
e