Which sentence uses the contraction for 'it is' correctly?

• A. Its a sunny day.
• B. Its' going to be fine.
• C. It's sunny outside.
• D. It's dog is barking.

Answer: (C)

Using the contraction for “it is” correctly relies on the apostrophe: it is written as it’s, with an apostrophe replacing the missing letter. The possessive form its has no apostrophe and means something belonging to it.

In the sentences here, the one that correctly uses the contraction is the one that says “It's sunny outside.” Here, it’s clearly “it is sunny outside,” and the apostrophe shows the contraction properly. The other sentences misuse its/it’s: writing its a sunny day uses the possessive determiner its instead of the contraction; its' going to be fine has an incorrect apostrophe placement; and It’s dog is barking attempts to use it’s but still leaves a grammar issue with the noun phrase that follows.