Correct choice is (d) 1/3
For explanation: Possible outcomes when a dice is thrown = {1, 2, 3, 4, 5, 6}
Multiples of 3 = {3, 6}
Total probability = \(\frac {number \, of \, multiples \, of \, 3}{number \, of \, possible \, outcomes} = \frac {2}{6}=\frac {1}{3}\)