If two angles are acute, their sum is never a straight line. the hypothesis of the statement is:
1) their sum is never a straight line.
2) two angles are acute.
3) if two angles are acute they are straight lines.
4) none of the choices are correct.

Step-by-step explanation:

Given that if two angles are acute, their sum is never a straight line.

The hypothesis of this would be the one which would satisfy the opposite of the given statement

1)  their sum is never a straight line.-- Incorrect.

2) two angles are acute -- incorrect because this is given.

OPtion 3 is right.

3) If  two angles are acute they are straight lines.