Listen to the audio clip. Which of the following sentences has the same meaning?

Question

(1 point)
Responses

I am certain that the river water is pure.
I am certain that the river water is pure.

It is not true that the river water is pure.
It is not true that the river water is pure.

I don't doubt that the river water is pure.
I don't doubt that the river water is pure.

I am sure that the river water is pure.
I am sure that the river water is pure.

Answer 1

I am sure that the river water is pure.