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.

Q: Question: In the xy-plane, a line has slope 5 and x-intercept 3. What is the y-intercept of the line?

 Option A: -15

 Option B: -3

 Option C: 0

 Option D: 3

 Option E: 9

A: Option A
****
Q: 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

A: Option A
****
Q: Question: At what rate percent on simple interest will Rs.750 amount to Rs.900 in 16 years?

 Option A: 6.25%

 Option B: 1.25%

 Option C: 4%

 Option D: 5%

 Option E: 3.25%

A:
Option B
****