Critical Reasoning

Some manufacturers of computer software have proposed cutting costs by distributing instruction manuals for their programs on computer disk only, so that computer users can refer to them on a computer screen rather than having to deal with unwieldy printed manuals that are costly for manufacturers to produce.

Which of the following, if true, provides the best reason against adopting the proposal described above?

(A) Most computer users are just as comfortable using instructions on a computer screen as they are
using printed manuals.

(B) Although instructions on a computer disk can be printed out cheaply using a computer printer, such printouts are less convenient to use than instructions displayed on a computer screen.

(C) Because they are expensive and inconvenient to copy, printed instruction manuals provide one of the best deterrents against the illegal copying of software, which costs manufacturers enormous
profits.

(D) Instructions supplied on a computer disk are more appropriate for business and educational
programs than for computer games and other entertainment software.

(E) Instructions supplied on a computer disk can be designed to provide more extensive and more easily utilized cross-references than those provided by printed manuals.

Only (C) weakens the proposal.

All the answers besides C strengthen the argument. Therefore, the correct answer is C

IMO -C