Explanation:

- The idiom "on tenterhooks" means being in a state of anxiety or suspense. Imagine hanging on something delicate, waiting for an outcome.

- Option 1: Very sad

- This means feeling deep sorrow or unhappiness.

- It doesn't capture the anxious anticipation implied by "on tenterhooks."

- Option 2: Very tense

- This describes feeling anxious or edgy.

- This matches the sense of being in suspense or anticipation.

- Correct Answer

- Option 3: Very happy

- This means feeling joy or elation.

- It contradicts the worried waiting in "on tenterhooks."

- Option 4: Very angry

- This describes feeling intense displeasure or rage.

- Again, it doesn’t align with the tense waiting conveyed by the idiom.