Question

Fill in blank (36):

• A. These
• B. It
• C. Them
• D. Those

Answer 1

The correct option is B It

Pronouns represent nouns that have been mentioned before.

The given sentence is about carbon dioxide, that 'the leaves break into carbon and oxygen'.

'It' is a pronoun that refers to things like carbon dioxide.

Hence option B is correct.

Option A: 'These' is a demonstrative that refers to plural countable nouns. But 'carbon dioxide' is an uncountable noun.

Option C: 'Them' refers to people, whereas 'carbon dioxide' is a thing.

Option D: 'Those' is demonstrative that refers to plural countable nouns whereas the noun 'carbon dioxide' is uncountable.

Hence options A, C and D are incorrect.