This is hyperbole: the speaker unlikely wants to literately die from this embarrassment: It's an exaggeration. Hyperbole is an exaggeration used to strengthen one's statement.
Probably of what they can do or what they did to show others how amazing they are.
I would say A, the elephant lumbered slowly to its water trough because its describing it's motion of how the elephant is moving
B
Imagery is something an author uses that you can hear, see, and feel.
