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: what is the sum of natural numbers between 30 and 100
Options: a. 4615, b. 4860, c. 5000, d. 5500, e. 5550

Answer: a


Question: Problem: if x ^ 2 – 4 x = 5, then one possible value of x – 2 =
Options: a. - 9, b. - 5, c. - 3, d. - 1, e. 5

Answer: c


Question: Problem: if i walk at 6 km / h, i miss the bus by 12 minutes. if i walk at 5 km / h, i reach 14 minutes before the arrival of the bus. how far i walk to reach the bus stand ?
Options: a. 13 km, b. 12 km, c. 11 km, d. 6.5 km, e. 5.5 km

Answer:
a