Which is a factor of 76?
a.
4
b.
14
c.
8
d.
12

The best thing to do is to divide 76 by all of them, and if it is whole number, it is a factor.
76/4= 19
76/14= 5.438
76/8= 9.5
76/12= 6.333
As the only whole answer is 19, this means that 4 is the only multiple here
Hope this helps :) 

The factors of 76 are: 1, 2, 4, 19, 38, 76

1 × 74 
2 × 38
4 × 19

Looking at the options given, A) 4 is a factor of 76, B) 14 is not shown, so it is not a factor of 76, C) 8 is not shown either, and finally D) 12 is not a factor of 76. This means that from the options that were given, the correct answer is A) 4.