Using the Notation C = Continuous and D = Discrete

Using the notation C = continuous and D = discrete, indicate whether each of the random variables are discrete or continuous.
a)The number of stair steps to the principal's office
b)The average night time temperature in July at the top of Long's Peak in Colorado
c)The number of forks in your kitchen
d)The number of sentences in a short story
e)The circumference of a California redwood tree
f)The number of grains of sand it takes to fill a quart jar