Explanation:

- The candidate answers 20 questions, scoring 72 marks in total.

- 5 marks are obtained for each correct answer.

- 2 marks are subtracted for each incorrect answer.

To find out the correct answers:

- Let the number of correct answers be x.

- Incorrect answers will be 20 - x.

Equation:

- 5x (marks for correct answers) - 2(20 - x) (marks deducted for wrong answers) = 72.

Solve the equation:

- 5x - 40 + 2x = 72

- 7x - 40 = 72

- 7x = 112

- x = 16

- Thus, the candidate answered 16 questions correctly.

Option 3 is correct.

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