To determine the correct preposition to fill in the blank, we need to consider how we express dates in English.
In English, we use the preposition "on" to indicate a specific day or date. Therefore, the correct answer is option B: "on".
Here's a breakdown of the options and their explanations:
A:
in
- We use "in" to specify a month or year, but not a specific date.
B:
on
- We use "on" to indicate a specific day or date, such as "on September 9th".
C:
at
- We use "at" to indicate a specific time, but not a date.
D:
of
- We use "of" to indicate possession or belonging, but not a date.
In this case, we're talking about a specific date of birth, so "on" is the appropriate preposition to use.
Therefore, the correct answer is option B: "on".