How did the respondent try to lighten the mood in the cockpit with the unhappy captain?

The correct choice highlights the method the respondent employed to ease the tension in the cockpit. Cracking jokes is a strategy often used in various interpersonal dynamics, especially in high-pressure environments like a cockpit. Humor can be an effective tool to diffuse stress and foster a more pleasant atmosphere.

Playing music, discussing personal topics, or using Quizlet could have their merits but may not directly address the immediate need to lighten a mood fraught with tension. Jokes can provide an instant way to create a connection and bring a smile, which is essential in maintaining crew morale and ensuring effective teamwork in challenging situations. This approach not only helps to alleviate the captain's unhappiness but also promotes a more collaborative and supportive environment.