The two____(bikes) tires were flat.

Possessive noun indicates ownership.

Plural possessive nouns end with an apostrophe "s" to the word.To form the possessive of plural noun that ends in -s, add an apostrophe (') to the end of the word. To form the possessive of a plural, the noun that does not end in -s, add an apostrophe (') and -s

Can you summarize what you’ve understood in the above steps?

Choice A is incorrect because "bike" is a singular noun, not plural. It should be "bike’s" to show possession by adding an apostrophe and an "s."

bike

Choice B is incorrect. "Bikes" is a plural noun. To show possession, add an apostrophe after the "s," like this: bikes'. This gives the plural possessive noun form of the word Bike.

bikes

Choice C is correct. Bikes' is a plural possessive noun because it shows that more than one bike owns something. Just like when we say, "the bikes' tires", it means the tires belong to more than one bike and by the sentence given we can say there are 2 bikes.

bikes'

Choice D is incorrect because it shows possession for one bike, but "bike" is singular, so it should be "bike’s" to show ownership. For plural bikes, it should be bikes' to show they belong to many bikes.

bike’s

Word given in the parentheses - bikes

Plural possessive noun for the given word - bikes'

Complete sentence - The two bikes' tires were flat.

Choice C

Can you summarize what you’ve understood in the above steps?