which of the following is a valid probability distribution?

Hi, I have a question and I hope anyone could answer it:

Which of the following is a valid probability distribution?

Probability distribution A is shown. The probabilities of 1, 2, 3, 4, 5 and 6 are all 0.2.

Probability distribution B is shown. The probability of 1 is 0.1; 2 is 0.2; 3 is 0.3; 4 is 0.3; 5 is 0.2; 6 is 0.1.

Probability distribution C is shown. The probability of 1 is 0.1; 2 is 0.2; 3 is 0.4; 5 is 0.1; 6 is 0.1.

Probability distribution D is shown. The probability of 1 is 0.2; 2 is 0.1; 3 is 0.1; 4 is 0.5; 5 is 0.1.

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