Fred and Ricky Are Identical Twins

Fred and Ricky are identical twins.Lucy and Ethel are fraternal twins.If intelligence is primarily a genetic trait,we would expect that

A) Lucy's and Ethel's IQ scores would be more similar to each other than Fred's IQ score would be to Ricky's.
B) Fred's and Ricky's IQ scores would be more similar to each other than Lucy's IQ score would be to Ethel's.
C) All four of the twins would have similarly close IQ scores.
D) Fred and Ricky would both have lower IQ scores than either Lucy or Ethel.