Select the most appropriate option that can substitute the highlighted segment in the given sentence. If there is no need to substitute it, select ‘No substitution required’.
After working for the entire week we usually go out to eat on Sundays.

Correct option is B

The correct option for the highlighted segment "on Sundays" is "No substitution required." This phrase is grammatically correct as it properly uses "on" with the plural form "Sundays" to indicate a recurring event that happens every Sunday.
The preposition "on" is used with days of the week when referring to repeated events. The use of the plural "Sundays" correctly implies that this is a habitual activity that occurs every Sunday.
Example: They attend choir practice on Tuesdays.
Meanings of the other given options:
· At Sundays: Incorrect because "at" is not typically used with days of the week.
· On Sunday: This would suggest the activity happens on a specific Sunday, not regularly.
· At Sunday: Also incorrect, as "at" is not the correct preposition to use with days.