A company wanted to know if a special gas additive truly (and significantly) aff

A company wanted to know if a special gas additive truly (and significantly) affected the gas mileage in their company vehicles. Use the data below to determine whether or not the additive significantly affected gas mileage. 

Data:

Vehicle   mpg pre   mpg post
1             15           18
2             13            19
3              17            17
4              21            24
5             14           18
6             16           21
7             18           19
8             17           20

Choice:

A	Yes, because the T-statistic of 3.125 exceeded the T-critical value of 2.365
	B	Yes, because the T-statistic of 4.51 exceeded the T-critical value of 2.365
	C	No, because the T-statistic of 0.563 failed to exceed the T-critical value of 2.365
	D	Yes, because the T-critical value is 1.895