The list below shows the ages of 10 visitors at a museum one morning. 17 30 17 26 48 39 18 45 17 32

The median age of the 10 visitors was 28. The median age of the visitors remained the same after the ages of two more visitors were added to the list. What are the possible ages of these 2 visitors?

a
17 and 18
b
18 and 26
c
26 and 32
d
39 and 48