Answer:
The right answer is: d. self-censorship
Step-by-step explanation:
This example concerns a combat situation in the military, but the described behavior is very common in many professions. The captain is convinced that the general´s strategy won´t be sucessful and that many lives will be lost, but he´s afraid of saying his opinion because other officers or even some of his own soldiers may think he´s a coward. Such examples have been seen in real-life cases in historical wars. Judging that he couldn´t stand repudiation or even a risk to his own career, he prefers to remain silent, to censor himself.