Engineers must with clients to show how their solution is the best one possible.

Hi there!

Since there are no options given in your question I will say that the answer is as follows.

Engineers must communicate with clients to show how their solution is the best one possible.

Communication is key in business when trying to get your point across or when you need to know what a client or partner wants or has planned. Without communication, we could not explain or show anyone how your solution is the best one there is available no matter what else competition might have to offer.

-Sincerely your friend in tech, 
ASIAX   Frequent Answerer

  answer clean and tinned with melted solder;