1. Which is an open-ended question that could be used to start a discussion?

Do you take the bus?

Why do you think the bus should run more often?

What time does the last bus leave?

How many people take the bus?

An open-ended question is that could be used to start a discussion, 'Why do you think the bus should run more often?' is an open-ended question.

Answer: B

Explanation

A question which does not have an answer as 'yes' or 'no' are open-ended questions.

They are questions where the answers are expected to be more than a single word.

To start a group-discussion or conversation, these questions play a vital role in bringing opinions of everyone participating in the discussion or conversation.

The rest questions mentioned above have answers only as 'yes' or 'no'.

Why do you think the bus should run more often?

Explanation:

You or/and your friends can have many different answers and can be argued