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: if x and y are positive integers and 3 + x + y + xy = 17, what is the value of x + y ?
Options: a. 3, b. 5, c. 6, d. 8, e. 9

A: c
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Q: Problem: a rhombus has area 432 sq m, one diagonal is 36 cm. find other diagonal ?
Options: ['a. 2400 m', 'b. 2500 m', 'c. 2600 m', 'd. 2700 m', 'e. 2900 m']

A: a
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Q: Problem: a rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered. if the area of the field is 800 sq. ft, how many feet of fencing will be required ?
Options: a. 100 feet, b. 120 feet, c. 150 feet, d. 180 feet, e. 186 feet

A:
a
****