Rearrange the order of the following sentences so that they can be coherent. 
a. He spent the first fifteen minutes of the hour working on the first of ten examination problems.
b. He spent other minutes doodling on his test paper,  
c. Jose did not complete his mathematics examination yesterday.
d. Like many college students, he does not know how to use time profitably during an examination 
Which of the following is the best answer?