Correct option is A
Option (a) is the correct meaning of the given idiom.
Idiom Meaning: "Get up on the wrong side of the bed" refers to someone being in a bad mood for no clear reason throughout the day. (बिना वजह चिड़चिड़े मूड में रहना)
Example: Don’t mind him—he must have gotten up on the wrong side of the bed today.
Other related idioms and their meanings:
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Down in the dumps – Feeling sad or depressed.
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A storm in a teacup – A lot of fuss about a small problem.
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Throw a tantrum – To have a sudden burst of bad temper.