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.

Q: Problem: jack has two dice, one has 6 equally probable sides, labeled 1, 2, 3, 4, 5, 6, and the other has 7 equally probable sides, labeled 1, 2, 3, 4, 5, 6, 7. if jack rolls both dice what is the probability that both of the number ' s sum will be 13 ?
Options: a. 3 / 14, b. 2 / 7, c. 1 / 3, d. 1 / 42, e. 12 / 21

A: d
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Q: Problem: a 16 % stock yielding 10 % is quoted at :
Options: a. 83.33, b. 110, c. 112, d. 120, e. 160

A: e
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Q: Problem: if ryan and smith car ratio is 5: 8. ryan bought 6 new car and smith bought 2 new car. now, smith has 18 car. what is their car ratio now ?
Options: a. 5: 4, b. 3: 2, c. 8: 9, d. 6: 5, e. 7: 5

A:
c
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