May 7, May 13, May 20.
This is because the pattern is (Black is not wearing):
Jeans: ⚫️⚫️⚫️
Shoes: ⚫️⚫️⚫️⚫️
An exponential function has a graph that is a smooth curve; it either increases at an ever increasing rate or decreases at an ever increasing rate. The only graph that fits these characteristics is the first one.