Which of the following may replace the phrase "trawl through" ( Line 3, Para. 2)

A．Publicity can mislead students' choice and perception of the employers.
B．The competition between the firms is essentially the grabbing of the talents.
C．Students are easily be influenced by the flood of the companies' publicity.
D．Universum plays an essential role in the job-hunting of the students.

A．promoting their image
B．improving the reputation of their products
C．taking advantage of advertisements and media
D．revealing the truth of the firms