Which of the Following Individuals Is Providing Affirmative Consent

Which of the following individuals is providing affirmative consent?

A) Kayla,who is breathing hard,is flushed,and seems aroused although she isn't saying anything.
B) Ken,who said that he had hoped to have sex later in the evening,and who now has a strong erection.
C) Kris,who agrees to sex after her partner threatens to spread rumors about her unless she agrees.
D) Keisha,who says she wants to have sex and asks if her partner does as well.