GMAT Critical Reasoning (CR) | Re: The president of a consulting firm analyzed the decisions

The president of a consulting firm analyzed the decisions made about marketing by her clients and concluded that the decisions were correct only about half of the time.

The conclusion above depends on the presupposition that

(A) companies can be successful even when about half of the decisions they make about marketing prove to be wrong
(B) companies hiring her consulting firm make no more incorrect marketing decisions than do companies in general
(C) executives consistently making correct marketing