In the question below, a word is given and used in three different sentences. Identify the statement(s) where the word has been used in a contextually and grammatically correct manner.

SUBSTANCE

(A) The substance of his speech focused on environmental sustainability rather than politics.

(B) The police tested the unknown substance found in the container at the laboratory.

(C) She substance her argument with statistics from recent market research.

The correct answer is Both (A) and (B).

Let us analyze the usage of the word SUBSTANCE in each of the given sentences:

Statement (A): "The substance of his speech focused on environmental sustainability rather than politics."
In this sentence, substance is used correctly as a noun meaning the core theme, essence, or most important part of something. Therefore, statement (A) is grammatically and contextually correct.

Statement (B): "The police tested the unknown substance found in the container at the laboratory."
In this sentence, substance is used correctly as a noun referring to physical material, matter, or a specific chemical compound. Therefore, statement (B) is grammatically and contextually correct.

Statement (C): "She substance her argument with statistics from recent market research."
In this sentence, substance is incorrectly used as a verb. The proper verb form required here is substantiated (meaning to support or establish with proof/evidence). Therefore, statement (C) is grammatically incorrect.

Thus, only statements (A) and (B) feature the word in a correct manner.