Which sentence is a simile?

Which sentence is a metaphor?

Does the following sentence contain a simile or metaphor? "I am drowning in an ocean of despair."

Does the following sentence contain a simile or metaphor? "When Courtney's parents caught her yelling at her sister, she would often immediately quiet and act like an angel."

Does the following quote from "As I Lay Dying" by William Faulkner contain a simile or metaphor? "He looks like right after the maul hits the steer and it no longer alive and don’t yet know that it is dead."