The correct option is C. "simple" most nearly means Unadorned.
Simple words can have one or more syllables, but the meaning of a multisyllable word is independent of the meaning of any one syllabic. Word Segmentation in Indo-China Languages for Digital Libraries has further information.
A simple sentence presents a complete notion as an independent clause and includes a subject (a person, thing, or activity) and a predicate (a verb or verbal phrase that defines the action). Dependent or subordinate clauses are not allowed in simple sentences.
