Pls Help!!! What is the parent function?

a.)
b.)
c.)
d.)

B
If need step by step please message me! And yes this is the right answer!

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

Where's the rest of the