Answer:
A) Our staid coach surprised us with a joke that was totally out of character
Explanation:
Although staid's denotative meaning is "sedate, respectable, and unadventurous," the word is often used to describe people who are stodgy or dull. If one was surprised by someone telling a joke, and calls that "out of character", then we can infer that that person was usually rather boring. Therefore, using context clues, we can infer that this is the correct use of staid.
