Question

what determines whether someone is rh positive or negative?
the type of hemoglobin
the blood plasma type
the type of white blood cells
the presence of rh antigens

Explanation:

The Rh factor is determined by the presence or absence of Rh antigens on the surface of red - blood cells. If Rh antigens are present, a person is Rh - positive; if absent, Rh - negative. Hemoglobin is related to oxygen - carrying capacity, blood plasma type is different from Rh factor determination, and white blood cells are part of the immune system and not related to Rh factor.

Answer:

The presence of Rh antigens