Which of the Following Crosses Is a BACKCROSS

Multiple Choice

Which of the following crosses is a BACKCROSS?

A) Two independent pure-bred lines crossed with each other.
B) F₁ progeny crossed with a pure-breeding parent.
C) F₁ progeny crossed with F₂ progeny.
D) F₁ progeny crossed with F₁ progeny.
E) All of the options listed here could be considered a backcross.