Is this exercise of probabilities on dice correct?

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The excercise is:

The problem says:

We have a dice
It's numbered from 1 to 6
We roll it two times and each time we record the number we get
The first roll/number we record is "a"

and the second is "b"
The question says: Calculate the probability of each one of these:
A) "The two numbers a and b apply the equation: b = 2a + 1"
B) "a and b apply: |a - b | < 1"
C) "a and b apply: |a - b| > 5"

Here is how I solved it:

P(A) = 2 / 36

P(B) = 1

P(C) = 0

Is it correct? Please tell me with justification.