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: Look at this series: -2, 0, 2, 4,... What number should come next?

 Option A: 6

 Option B: 12

 Option C: 8

 Option D: 9

 Option E: 10

A: Option A
****
Q: Question: Find the fourth proportion to 2,4,6

 Option A: 18

 Option B: 12

 Option C: 9

 Option D: 6

 Option E: 8

A: Option B
****
Q: Question: An error 2% in excess is made while measuring the side of a square. The percentage of error in the calculated area of the square is:

 Option A: 1.04

 Option B: 2.04

 Option C: 3.04

 Option D: 4.04

 Option E: None of these

A:
Option D
****