Select correct answer.

Tyler was responsible for checking the equipment outside the spaceship. He was relieved to see no aliens on the moon when he got outside.

Tyler was responsible for checking the equipment outside the spaceship. He was relieved to see no aliens on the moon when he got outside.

In the first sentence, we need to use a gerund after the adjective responsible and the particle for (responsible + for + gerund).

Tyler was responsible for checking the equipment outside the spaceship. He was relieved to see no aliens on the moon when he got outside.

In the second sentence, we need to use to-infinitive after the adjective relieved.