Answer: B. 4
Explanation:
Hi, to answer this question we have to analyze the information given.
She only has enough money to purchase 1 pizza.
He can divide it into as many slices as she would like.
The number of people that will be eating will be either 3 or 4, including herself.
So, to ensure that everyone gets an equal number of slices she has to divide the pizza into 4 slices, because the worst case scenario is that 4 people (including herself) will be eating.
1/4 of pizza for each one.
Feel free to ask for more if needed or if you did not understand something.