Final answer:
The correct antonym for 'unbridled' as an adjective is 'restrained', which suggests control and limitation, as opposed to the uncontrolled nature of the word 'unbridled'.
Step-by-step explanation:
The correct answer is option c) restrained. The adjective unbridled means something that is not controlled or restrained; therefore, the antonym would be an adjective that suggests control or limitation. The options presented are a) unrestrained, which is a synonym of unbridled, b) muted, which refers to being quiet or softened but not the opposite of unbridled in the context of control or freedom, c) restrained, which directly suggests control and is therefore the correct antonym, and d) unchecked, another synonym for unbridled. Hence, among the given choices, restrained is the correct antonym for unbridled.
The correct answer is option c) restrained. An antonym is a word that has the opposite meaning of another word. 'Unbridled' means lacking restraint or control. Therefore, an antonym for 'unbridled' would be a word that means restrained or controlled. Option c) restrained fits this definition, as it means to hold back or limit.