Given the task definition and input, reply with output. 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: in a certain large company, the ratio of college graduates with a graduate degree to non - college graduates is 1: 8, and ratio of college graduates without a graduate degree to non - college graduates is 2: 3. if one picks a random college graduate at this large company, what is the probability q this college graduate has a graduate degree ?
Options: a. 1 / 11, b. 1 / 12, c. 1 / 13, d. 3 / 19, e. 3 / 43
d