Select the correct passive form of the given sentence.
Air travel can spread a pandemic worldwide within days.

Correct option is A

The correct passive voice of the given sentence is (a).
Explanation:
· The sentence is in modal + base verb form: “can spread”
· Passive structure with modal: modal + be + past participle
Structure:
· Active: Subject + can + V1 + object
· Passive: Object + can + be + V3 + by + subject
Example:
· Active: Pollution can harm the lungs.
· Passive: The lungs can be harmed by pollution.
Why others are incorrect:
· (b) “shall” changes the meaning and tense.
· (c) “is spread” is present simple passive, not matching “can”.
· (d) Illogical – “an air travel” is grammatically wrong.