In paragraph three, how many ways are mentioned as the illustration of the fact that science students take advantage of computers

A．analyse the advantages and disadvantages of computers in education
B．persuade educators to increase computer use in the classrooms
C．describe how computers can be useful to science and business students
D．identify some of the ways computers benefit college students'

A．saves a lot of time revising a paper
B．feels at ease composing a paper
C．spend less time in composing a paper
D．does not have to write a paper