PLS HELP I WILL MARK BRAINLIST AND GIVE THANKS!!

Answer:
The answer is B.
Step-by-step explanation:
When you have three numbers in the left bubble, and 4 on the right for "mapping a," you cant have 2 going into one number on the right. You can only have 1 number going into 2 (shown in the mapping b image).
Thus, the answer will be "Mapping B."