What is difference between monohybrid cross and a dihybrid cross?

Question

in a monohybrid cross the parents have all the same traits.

in a dihybrid cross, the parents have two traits that are the same.

in a monohybrid cross, the parents differ in one trait. In a dihybrid cross, they differ in two traits.

in a monohybrid cross, the parents have one trait that is the same, and in a dihybrid cross the parents have two traits that are the same.

Answer 1

Third choice is correct.

We're looking for how many traits are different, and mono means one; di means two.