Fill in the blank with the most appropriate option.

She was greatly _____ by the nightmare she had.

perturbed

The most appropriate option to fill in the blank is perturbed.

The word perturbed means to make someone feel uneasy or disturbed. In this context, the sentence is saying that she was greatly perturbed by the nightmare she had. This means that the nightmare made her feel uneasy or disturbed.

The other options are not as appropriate.

• Feared means to be afraid of something. It is not as strong as perturbed and does not convey the same sense of unease or disturbance.
• Dreaded means to be filled with fear or dread. It is a stronger word than perturbed and could be used if the nightmare was particularly frightening.
• Trembled means to shake or quiver with fear or excitement. It is a physical reaction to fear and does not convey the same sense of unease or disturbance as perturbed.