Answer:
D
Explanation:
To find the total number of paintbrushes in the classroom, we need to multiply the number of paintbrushes on each student's desk by the number of students.
Since there are 5 students and each student has 2 paintbrushes, we can use the multiplication operation to find the total number of paintbrushes:
5 students × 2 paintbrushes per student = 10 paintbrushes
Therefore, the correct option is 4. 5 times 2.