The correct answer is A. frightened.
The word "frightened" means to be filled with fear or anxiety. It is the feeling of being scared or alarmed. When you are frightened, your heart rate and breathing speed up, and you may feel like you are going to die.
The other options are not correct because they do not describe the feeling of being scared.
- Excited: to feel eager and enthusiastic about something.
- Injured: to have been hurt or damaged.
- Unhappy: to feel sad or disappointed.
I hope this helps!