Which of the following can be represented by the equation below?

1,290 = 34d + 100
a.
a track team needs to run 34 miles by the end of the year, the team has already run 100 miles, and it averages 1,290 miles each day, d.

b.
a track team needs to run 1,290 miles by the end of the year, the team has already run 100 miles, and it averages 34 miles each day, d.

c.
a track team needs to run 1,290 miles by the end of the year, the team has already run 34 miles, and it averages 100 miles each day, d.

d.
a track team needs to run 100 miles by the end of the year, the team has already run 1,290 miles, and it averages 34 miles each day, d.