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.
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Question: Question: A reduction of 25% in the price of oil enables a house wife to obtain 5kgs more for Rs.800, what is the reduced price for kg?

Option A: 72

Option B: 27

Option C: 40

Option D: 28

Option E: 20

Answer: Option C

Question: Question: A train running at the speed of 60 km/hr crosses a pole in 21 seconds. What is the length of the train?

Option A: 350 m

Option B: 278 m

Option C: 876 m

Option D: 150 m

Option E: 267 m

Answer: Option A

Question: Question: When positive integer n is divided by 3, the remainder is 1. When n is divided by 11, the remainder is 9. What is the smallest positive integer k such that k+n is a multiple of 33?

Option A: 2

Option B: 4

Option C: 6

Option D: 8

Option E: 10

Answer:
Option A