Right choice is (b) \(\frac{1}{3}\)
To elaborate: A die has 6 faces. The faces are numbered 1, 2, 3, 4, 5 and 6. When a die is rolled, there are 6 outcomes possible. Outcome of getting odd number when a die is rolled is 3. Hence, probability of getting odd number when a die is rolled is \(\frac{1}{3}\).