The Muslims attend prayers in the mosque . . . . . . . . Friday. A. at B. in C. on D. from

The correct answer is: on.

The word “on” is used to indicate a specific day of the week. In this case, the Muslims attend prayers in the mosque on Friday.

The other options are not correct because they do not indicate a specific day of the week. The word “at” is used to indicate a specific time, the word “in” is used to indicate a specific place, and the word “from” is used to indicate a specific starting point.

Here are some examples of how the other options could be used in a sentence:

• The Muslims attend prayers at noon on Friday.
• The Muslims attend prayers in the mosque.
• The Muslims attend prayers from 10am to 12pm on Friday.