The correct answer is 4.

Solution:

We need to find the quotient when 20 is divided by 5.
20 ÷ 5 = ?
We use multiplication facts to find the quotient.
We find a number which when multiplied by 5 gives 20.
Using multiplication fact, we have:
5 × 4 = 20
By comparing this multiplication fact with the given division sentence, we have:
20 ÷ 5 = 4
So, the correct answer is 4.