Which Statement Best Summarizes the Benefit of Using Written Sales

Which statement best summarizes the benefit of using written sales proposals?

A) Written sales proposals offer the opportunity to provide detailed information that is generally perceived as being more credible than other forms of sales presentations.
B) Written sales proposals offer more flexibility in determining customer requirements.
C) Written sales proposals leave a lasting impression on the buyer.
D) Buyers like to evaluate written sales proposals because they show interest on the part of the seller.