QUICK I WILL MARK BRAINLIST!! do all of them to get brainlist and thanks

1.When a common denominator is found for the fractions 1/4 and, 2/3 what will the equivalent fractions be?
3/12 and 8/12
1/12 and 8/12
3/12 and 2/12
1/2 and 3/2

2.When a common denominator is found for the fractions 2/5 and, 5/6 what will the equivalent fractions be?
A. 12/30 and 25/30
B. 2/30 and 25/30
C. 2/30 and 5/30
D. 12/30 and 5/30

3.True or false, the common denominator between 3/7 and 1/3 is 21.
A. False
B. True

4.Which of the following can be a common denominator for the fractions 2/5 and 3/4?
A.5
B.10
C.4
D.20