Which equation models the problem below if c represents the number of babies whose eyes are closed? There are 12 babies in a photograph, and 9 of them have their eyes open. How many babies have their

Which equation models the problem below if c represents the number of babies whose eyes are closed?

There are 12 babies in a photograph, and 9 of them have their eyes open.

How many babies have their eyes closed?

a) 12 + c = 9

b) 9 + c = 12

c) c – 9 = 12

d) 9 – c = 12