Question

"good morning students , how happy am I to see you ! " said the teacher to the students , change the narration​

Answer 1

Answer:

The teacher told the students that they had to study hard for the test on comprehension.' can be used here as we often use 'had' with an infinitive verb instead of 'must' in the indirect speech. Thus option B is the correct answer. 

'The teacher told the students that they had to study hard for the test on comprehension.'

Answer 2

Answer:

The teacher greeted the students good morning and exclaimed that she is happy to see them

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