Which of the following sentences contains a noun clause?

tts Icon

What he read seemed to cause him great alarm.
tts Icon

What did he read?
tts Icon

He read something, and it seemed to concern him.
tts Icon

After reading the letter, he was alarmed.

1 answer

The sentence that contains a noun clause is:

What he read seemed to cause him great alarm.

In this sentence, "What he read" is a noun clause acting as the subject of the verb "seemed."