Which of the following defines an implicit sentence?
concluding assertion
direct statement
indirect statement
introductory assertion

The answer is "Indirect statement"

Explanation:

In general terms, the word "implicit" is an adjective used to describe elements that are hidden or implied which means they are not completely revealed. In the case of language, the word "implicit" is used to describe sentences, ideas, etc. that are not directly stated in a text or speech but suggested or implied. This means an implicit statement is the opposite of a direct or explicit statement. Additionally, indirect statements are commonly found in different texts and speeches and they can be related or not to the main idea of a speech or text. Considering the previous ideas the option that describes an implicit statement is "indirect statement".