You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

Question: The population of a certain town increases by 50 percent every 50 years. If the population in 1950 was 810, in what year was the population 160?

Option A: 1650

Option B: 1700

Option C: 1750

Option D: 1800

Option E: 1850
Option C

Question: A board of length L feet is cut into two pieces such that the length of piece A is 4 feet less than three times the length of piece B. Which of the following is the length, in feet, of piece A?

Option A: (L+4

Option B: (L-4

Option C: (3L-4

Option D: (3L-1

Option E: (3L+4
Option C

Question: When the positive integer p is divided by 9, the remainder is 5. What is the remainder when 3p is divided by 9?

Option A: 0

Option B: 1

Option C: 3

Option D: 4

Option E: 6
Option E