He found it odd that while attending lecture the professor got preachy, and even weirder when his fellow students started to what?\nOptions:\n- applaud\n- laughed\n- learning\n- taking notes\n- fall asleep
Step-by-step reasoning process below:

User
Applauding means to show praise by clapping. It's odd to praise a preachy professor. The answer: applaud.
Assistant