<p dir="ltr"><span><span>This question is a complex sentence. The main clause is “Sony Inc has offered to triple his salary,” preceded by an adverb clause “_______ much David’s employer is paying him,” and ending with another adverb clause “as long as he accepts the job offer.”</span></span></p><p>Let’s focus on the adverb clause preceding the main clause “________ much David’s employer is paying him.” Based on the meaning of the context, the adverb clause is “No matter how much David’s employer is paying him.” The phrase “No matter how” equals the adverb “However.” <br></p><p>(A) "Whichever" means “No matter which,” (B) "Whatever" means “No matter what,” and (C) "However" means “No matter how,” but this adverb clause wouldn’t make any sense if any of them is filled into the blank. </p>