There are 78 students from a local high school attending a concert. the concert hall has 40 rows of seats. the first row has 50 seats, and each row after that has 4 more seats than the one before. if all 78 students sit in one row and are as close to the front row as possible, in which row did the students sit?

a) row 7
b) row 8
c) row 11
d) row 12