When a die is rolled there are in total 6 possibilities.

∴ n(S) = 6

Let E denote event of getting 1 or 6

∴ n(E) = 2

∴ P(E) = 2/6 = 1/3

Hence,

P(E) = 1/3

As our answer matches only with option (c)

∴ Option (c) is the only correct choice.