Study the following table and answer the question.
The table depicts the number of oranges sold by shops A and B to males and females on Monday
| Shops | Number of oranges sold to males | Number of oranges sold to females |
| A | 21 | 26 |
| B | 39 | 37 |
What is the difference between the number of oranges sold by shops A and B to males?
1
11
2
18
3
15
4
2