what is the definition of lethargic?\na. tired\nb. thinking\nc. ruminate\nd. appropriate

Brief Explanations:

The word "lethargic" means having a lack of energy or being in a state of tiredness. Among the options, "tired" is the closest in meaning. "Thinking" and "ruminate" (which also means to think deeply) are related to mental activity rather than the state of being lethargic. "Appropriate" means suitable or proper, which has no relation to the meaning of "lethargic".

Answer:

A. tired