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.
--------
Question: Problem: find value for x from below equation ? x + 1 = - 3
Options: a. 1, b. - 4, c. - 1, d. 2, e. 3

Answer: b

Question: Problem: at a florist shop on a certain day, all corsages sold for either $ 20 or $ 30. if 10 of the corsages that sold for $ 30 had instead sold for $ 20, then the store ' s revenue from corsages that day would have been reduced by 20 percent. what was the store ' s actual revenue from corsages that day ?
Options: a. $ 200, b. $ 400, c. $ 500, d. $ 800, e. $ 1000

Answer: c

Question: Problem: a horse is tethered to one corner of a rectangular grassy field 42 m by 26 m with a rope 16 m long. over how much area of the field can it graze ?
Options: a. 154 cm 2, b. 308 m 2, c. 201 m 2, d. 205 m 2, e. none of these

Answer:
c