Answer: A) Tuesday, August 11, is the date on which we will visit New York City.
Explanation: When we need to introduce an explanation or clarification in a sentence, this must be placed between commas and after the word or phrase that we are clarifying. In the given sentence the subject is "Tuesday" and the phrase "August 11" is giving additional information about the subject, so it must be between commas. From the given options, the one that is punctuated correctly is opiton A.
