Answer:
Option C, Infinitive.
Step-by-step explanation:
The sentence 'he couldn't bring himself to move, he was afraid someone would hear him' has the basic element of an infinitive phrase. If we look into an infinitive phrase, it comprise of any verb that is preceded by the word 'to'.
For example: to move, to sleep, to cry, etc.
Or
She couldn't put the baby to sleep.
We wanted him to choose his own path.
To read is an important practice.