The synonym of 'serene' is?

Explanation:

"Serene" is an adjective that describes a state of being calm, peaceful, and undisturbed. Therefore, the synonym of "serene" is "calm." Here's a breakdown of the options:

a) severe - This means strict, harsh, or extreme. It is the opposite of "serene."

b) dark - This refers to the absence or deficiency of light. It is unrelated to the meaning of "serene."

c) calm - This is the correct answer. Calm means peaceful, undisturbed, and tranquil, which aligns with the meaning of "serene."

d) serious - This means showing deep thought, not joking, or significant. While it may share some connotations with "serene" in terms of a lack of frivolity, it doesn't fully capture the sense of tranquility associated with "serene."