Elizabeth takes a prescription drug that dilates her arterioles. What does this do to her blood pressure? Why?

A) It falls because this increases the cross-sectional area of the vessels.
B) It rises because this increases the cross-sectional area of the vessels.
C) It falls because this decreases the cross-sectional area of the vessels.
D) It rises because this decreases the cross-sectional area of the vessels.
E) It stays the same because venules, not arterioles, control blood pressure.