The correct answer is D. no article.
The word "tennis" is a countable noun, which means it can be used with a number. In this case, we are not specifying which tennis game we are playing, so we do not need an article.
If we were specifying which tennis game we were playing, we would use the appropriate article. For example, if we were playing a game of singles tennis, we would say "Let us play the singles tennis match."
We would also use an article if we were talking about tennis in general. For example, we might say "Tennis is a great sport." In this case, we are not referring to a specific game of tennis, but rather to the sport of tennis in general.
I hope this helps!
