ACT scores are normally distributed. In 2007, the average ACT score was 21.2, and the standard deviation of scores was 5.0. If 1,300,599 students took the ACT in 2007, how many students scored less than 28.3?

a. 987,423 students

b. 236,718 students

c. 1,125,046 students

d. 1,033,201 students