Tyson wrote this expression to describe the total amount of points he won in both rounds of a game.

which situation could be described by this expression?

f+15

a.
tyson doesn't know how many points he earned in the first round. he knows that he earned 15 points in the second round.

b.
tyson doesn't know how many points he earned in the first round. he knows he earned a total of 15 points in the whole game.

c.
tyson doesn't know how many points he earned in the first round. he knows that the points were 15 times more than the second round.

d.
tyson doesn't know how many points he earned in the first round. he knows that he made 15 more points in the second round than the first round.