Correct Option: B

degenerate (Verb) : to become worse ; deteriorate
flourish (Verb) : to develop quickly and be successful or common ; to grow well ; to be healthy and happy ; thrive
perish (Verb) : to die ; to be lost or destroyed
decay (Verb) : to be destroyed gradually by natural processes ; rot
dismiss (Verb) : to decide that somebody/something is not important and not worth thinking or talking about