Correct option is A
The correct substitution of the quoted words is "on".
Explanation: "In" is incorrect when referring to specific dates; "on" is the proper preposition to use. This is because "on" is used for specific days and dates, while "in" is generally used for months, years, and longer periods.
Grammatical rule used: Use "on" for specific days and dates.
Example: I was born on July 4th, 1990.