The house was around the corner from our house was for sale.

which

that

The correct option is THAT

Explanation:

A relative pronoun is used to connect a clause to a noun or pronoun in order to describe it.  Among the most common relative pronouns highlight who, whom, whose, which, and that.

They can be classified into two different categories; defining and non-defining relative clauses. Defining clauses gives essential information about the noun, while the non-defining clause could be deleted and the sentence would have the same information.

Bearing in mind the above, it could be said that the sentences would result as follow:  The house THAT was around the corner from our house was for sale.  This because the Defining clause "that" gives essential information about the house.

summary - a brief statement or account of the main points of something.

main idea - the main idea is defined as the main point of a speech or piece of writing.

paragraph - a distinct section of a piece of writing, usually dealing with a single theme and indicated by a new line, indentation, or numbering.

that's conceptually impossible.

if i wrote it, it wouldn't be a 'shakespeare' sonnet.