Jefferson wrote this expression to describe the number of papers he still has to deliver.

45-p

which situation could be described by this expression?

a.
jefferson knows he has delivered 45 papers. he does not know how many he has left to deliver.

b.
jefferson knows he has to deliver 45 papers. he does not know how many he has already delivered.

c.
jefferson doesn't know how many papers he has delivered. he knows he has 45 left to deliver.

d.
jefferson doesn't know how many papers he has delivered. he knows it is 45 less papers than he delivered yesterday.