Correct option is A
Option (a) contains an error. Explanation: The phrase "yesterday at hall" is incorrect.
In English, "at" is used with specific places, but it usually needs an article when referring to a specific place like "hall."
The correct phrase should be "yesterday at the hall."
Grammatical Rule Used: When referring to specific locations, articles such as "the" are used to specify a particular place.
Example: The event will take place at the stadium, not "at stadium."