Select the most appropriate option that can substitute the highlighted segment in the given sentence.
Every nook and corner of the house were unclean.

Correct option is D

The correct substitution of the highlighted words is (d) of the house was unclean.

Explanation:

• The phrase “Every nook and corner” is a singular subject despite referring to multiple parts.
• Hence, it requires a singular verb – "was", not "were".
• The correct preposition to show relationship to “the house” is "of", meaning belonging to or part of.

Grammatical rule used:

• Subject-Verb Agreement: “Every” before a compound subject (nook and corner) makes it singular.
• Preposition Use: “Of” is used to show possession or connection.

Example: Every room of the hotel was clean.