According to the Statement, Extension, and Elaboration method, the sentence that is an elaboration is option A. Spring is the time of nature s renewal after a long winter.
A sentence is considered as a statement if it consist of definite expression within a writing, without any extension or elaboration to follow it. A statement is usually often used in order to get a counter question. After the counter question is received, then the statement could be extended or elaborated to form an opinion.