A

Step-by-step explanation:

all of them arw multiples of 2

Answer:

A. 2

Step-by-step explanation:

Factors for 20: 1, 2, 4, 5, 10, and 20

Factors for 24: 1, 2, 3, 4, 6, 8, 12, and 24

Factors for 26: 1, 2, 13, and 26

As you can see when you list out the factors of each number, 2 is the greatest number that 20, 24, and 26 divides into.