Sober means not affected by alcohol, clear-headed, very serious, sensible,…

Antonyms of Sober are:: light-hearted, frivolous, sensational, emotional,…

Tiny

expectation

Tragic: causing or characterized by extreme distress or sorrow.

Mysterious: difficult or impossible to understand, explain, or identify

Comic: causing or meant to cause laughter.

Incredulous: (of a person or their manner) unwilling or unable to believe something

Gravity

Started: begin or be reckoned from a particular point in time or space; come into being.
Finished: brought to an end; completed.
Terminated: bring to an end.
Unlocked: not locked
Closed: not opened.
Commissioned: bring (something newly produced) into working condition.

Antonym of Commissioned is Terminated

Distress (torment, trouble) is an antonym of assuagement which means to make (an unpleasant feeling) less intense.

Conceal

Relaxed

Antonym of impertinent is respectful

impertinent: not showing proper respect; rude.
healthy: in a good physical or mental condition.
respectful: feeling or showing deference and respect.
inadequate: lacking the quality or quantity required.
smooth: having an even and regular surface.

Breakthrough

Meaning: Dyspeptic is a person with poor digestion, something that relates to poor digestion or a depressed person.

Example: A common dyspeptic type would be an old man shouting “get off my lawn!” to kids.

Nadir

ethical

Pacify: quell the anger, agitation, or excitement of

Foot: the lower extremity of the leg below the ankle, on which a person stands or walks.

Coddle: treat (someone) in an indulgent or overprotective way.

Unhand release (someone) from one’s grasp.

Thus option A is correct.