Choose the most suitable option to fill in the blank.

She told me yesterday that her classes will begin ______ 11 a.m.

Correct option is D

Explanation:

The correct answer is  at.

When referring to specific times of the day, we use "at". In this case, "11 a.m." is a specific point in time, and "at" is the appropriate preposition to indicate that.

Information Booster:

Preposition "at" for specific times:

The preposition "at" is used for exact times, such as hours, minutes, and specific points in time.

Examples:
"The meeting will start at 9 a.m."
"I will call you at noon."

Usage of Prepositions with Time:

"At" is used with times of the day, including:
"at 6 o'clock," "at midnight," "at noon," "at 11 a.m."

Since 11 a.m. is a specific time, "at" is the proper preposition to use here. The sentence talks about a specific moment in time (the start of the classes), so we choose "at".

Additional Knowledge:

"on" is used for days and dates, so it’s incorrect here (e.g., "on Monday," "on the 5th of May").
"until" is used to express a time limit or duration (e.g., "The meeting will last until 2 p.m."), but it’s not used to indicate when something will begin.
"in" is used for general periods, such as months, years, or seasons (e.g., "in the morning," "in 2023," "in April"), but not for specific times.