Fill in the blank with the most appropriate word:
That's the house _______ I was born.

Answer : C

Explanation:

Relative adverb is a word or phrase that is used to introduce a clause that tells us more about a noun.

Here in this case, it is in reference to "the house" and the correct relative adverb is "where".

"where" is used for referring places.

"that" is used to refer to a specific thing/person.

"which" is generally used for things/inanimate objects.

"when" is used to reference to time.

Therefore the correct complete sentence is :

That's the house WHERE I was born.