Step 1: Understanding.
The direct command "Work hard" in indirect speech becomes either "ordered," "requested," or "advised," depending on tone.
Step 2: Checking options.
(A) Ordered — too strict, not implied.
(B) Requested — does not fit the tone.
(C) Will ask — incorrect tense.
(D) Advised — best suited as "Work hard" is advisory in tone.
Step 3: Conclusion.
Correct answer is (D) Chotu advised Vishal to work hard.