Topic: Synonyms, Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The term "lunar" is derived from the Latin word "luna," which means "moon." When considering its synonyms, it can be helpful to explore how the moon is often linked to human emotions and psychological states. The correct answer "C) mood" reflects this connection; many cultures associate the moon with influencing moods and emotional swings.

For instance, the phrase "lunar effects" pertains to the belief that the phases of the moon can impact human behavior and feelings. This idea is prevalent in psychology and folklore, with terms like "lunar lunacy" referring to the notion that the moon can cause erratic or intense emotional states.

In contrast, the other options—A) sun, B) planet, and D) air—do not share the same emotional or psychological linkage with the term "lunar." The sun relates more to daylight and vitality, planets refer specifically to celestial bodies, and air is a fundamental element without an emotional connotation.

Therefore, the best synonym related to "lunar" in the context of emotional influence is "mood."