Pick the set of numbers which contain all perfect squares:

a. {2,4,8,16,32}
b. {10,20,30,40,50}
c. {1,2,3,4,5}
d. {81,16,25,49,1}

Well, a way to do this problem would be to find the set of numbers that all of rational square roots. A list of perfect squares would be 1^2=1, 2^2=4, 3^2=9, 4^2=16, 5^2=25, 6^2=36, 7^2=49, 8^2=64, 9^2=81, 10^2=100.