Respuesta :
Answer:
4 (four) is the correct answer.
Step-by-step explanation:
For this question, it is necessary to add the number of items Max has donated and Mia's items. Regrouping refers to carry when we do an addition.
If we add 16+4, we must regroup because 6+4 = 10, carrying 1 to the tens column, meaning that we must regroup. So four is the correct answer.