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: find the sum of first 89 odd numbers
Options: a. 7921, b. 4800, c. 7900, d. 4980, e. 4960
a

Problem: john left home and drove at the rate of 45 mph for 2 hours. he stopped for lunch then drove for another 3 hours at the rate of 45 mph to reach his destination. how many miles did john drive ?
Options: a. 235 miles., b. 245 miles., c. 225 miles., d. 265 miles., e. 275 miles.
c

Problem: in cliff ’ s impressive rock collection, there are half as many igneous rocks as sedimentary rocks. of the igneous rocks, 2 / 3 are shiny and the rest are matte, while 1 / 5 of the sedimentary rocks are shiny. if there are 40 shiny igneous rocks, how many total rocks does cliff have ?
Options: a. 180, b. 45, c. 60, d. 90, e. 135

a