Question

part a this sentence is from the passage. \cars are built around engines, and engines (or internal combustion engines, to give them their full name) burn petrol with oxygen in the air to release the energy locked inside it.\ (paragraph 3) what does the word it refer to in this sentence? 1. the engine 2. the petrol 3. the oxygen 4. the air

Explanation:

The sentence mentions engines burn petrol with oxygen to release energy locked inside 'it'. The energy is in the petrol, so 'it' refers to petrol.

Answer:

1. the petrol