Question

2. Doug crouched down onto his knee and nervously asked for Joan's hand;

Answer 1

That would be an example of a synecdoche! You can easily rule out both a pun and an oxymoron as an option! Because if it were a pun, where is the punchline? And it’s not an oxymoron because nothing is contradicting itself. Hope this helped, have a groovy day! :>