Question

sita isn't home yet she .......be caught up in a traffic jam​

Answer 1

Sita isn't home yet. She must be caught up in a traffic jam​.

• The word used here is 'must' which is a modal verb.

• Modal verbs are used along with the main verbs for suggesting possibilities, request, permission, obligation, etc.

Example- can, could, may, might, etc.

• Usages of 'must' - refers to obligations, gives strong recommendations, speculating about some truth. It can also be used in interrogative and negative sentences.

Examples:

1. She must be asleep.

2. You must not cross the line.

Answer 2

Sita isn't home yet she may/might/could be caught up in a traffic jam​.

Explanation

We are here talking about a possibility. The modal verbs that we use to talk about possibility are: may, might, could.

We use may or might to talk about the possibility of something.

We can use could to say that something is possible.