Depending on skillful suggestion, argument is seldom used in

The answer can be between B & C, All other options can be easily eliminated.

(B) Argument is seldom used in advertising, which depends instead on skillful suggestion.

B is not a perfect choice but it is better than C.

(C) Skillful suggestion is depended on by advertisers instead of argument.

Wrong comparison in C .

Why is option B preferred over option A?

Depending on skillful suggestion, argument is seldom used in advertising.

(A) Depending on skillful suggestion, argument is seldom used in advertising.
(B) Argument is seldom used in advertising, which depends instead on skillful suggestion.
(C) Skillful suggestion is depended on by advertisers instead of argument.
(D) Suggestion, which is more skillful, is used in place of argument by advertisers.
(E) Instead of suggestion, depending on argument is used by skillful advertisers.

This is a good question.
There is indeed an error in modification due to the word order.
The dangling modifier ''depending'' is supposed to modify ''advertising'', and not argument. We know that an argument is an argument and not a skillful suggestion though it may be; however, in this sentence, the author is communicating that advertising depends on skillful suggestion and not on argument which we know to be an extension of reasoning.
An argument is a reasoning, not a suggestion unlike advertising as is argued by the author in this sentence.

C is plainly wrong because of the erroneous meaning it conveys.
D is wrong in its meaning
E is has meaning issues.

Between A and B
B wins because it has no meaning issues in it as explained above.