HELP IM ON LIMITED TIME!

DNA sequences are analyzed for a particular protein that humans and
four other animals share. Based on this evidence alone, which animal
has the closest evolutionary relationship with humans?

Humans and chickens - 3 different DNA molecules
Humans and horses - 1 different DNA molecule
Humans and tuna - 5 different DNA molecules
Humans and frogs - 4 different DNA molecules

Select one:
Tuna
Chicken
Frog
Horse