Answer:
A and C
Explanation:
The signs for blood (positive or negative) from the donor always has to match the blood for the patient.
Type A- blood can only donate to A- blood or AB- blood.
Type B- blood can only donate to B- blood or AB- blood.
Type AB- blood can only donate to AB- blood.
Type O- blood can only donate to O- blood, AB- blood, A- blood, or B- blood.
Type A+ blood can only donate to A+ blood or AB+ blood.
Type B+ blood can only donate to B+ blood or AB+ blood.
Type AB+ blood can only donate to AB+ blood.
Type O+ blood can only donate to O+ blood, AB+ blood, A+ blood, or B+ blood.