A word has been given in the question and used in the sentences below. Identify the statements where the word has been used in a contextually and grammatically correct manner.
INCESSANT
(A) The incessant rain caused severe flooding in several low-lying areas.
(B) His incessant dedication to study ensured he topped the examination.
(C) The speech was incessant for only five minutes before it ended abruptly.

To determine the correct usage of the word INCESSANT, we must first understand its meaning and grammatical usage:

Definition: Incessant is an adjective that means continuing without pause or interruption, especially to an annoying or unpleasant degree (e.g., constant, never-ending, unceasing).

Now let us analyze each sentence:

Statement (A): "The incessant rain caused severe flooding..."
Here, "incessant rain" refers to rain that is continuous and does not stop. This is a common and contextually accurate usage of the word, as continuous rain leads to flooding.

Statement (B): "His incessant dedication to study ensured he topped the examination."
In this context, "incessant dedication" refers to constant, unwavering, and unceasing effort or commitment to his studies. While "incessant" often carries a negative connotation (like incessant noise), it is also grammatically and semantically acceptable to describe continuous, non-stop dedication or activity in a neutral or positive sense. Therefore, this usage is correct.

Statement (C): "The speech was incessant for only five minutes..."
This statement is contradictory and incorrect. A speech that lasted "for only five minutes before it ended abruptly" cannot be described as "incessant" (unceasing or endless), as the duration was very short and it terminated quickly.

Thus, the word has been used correctly in both statement (A) and statement (B).

Therefore, the correct option is Both (A) and (B).