Inferential/Descriptive Statistics?

I cant figure out each of the following correct answer.

(a)By examining the results of a statewide poll it was estimated that 52% of the registered voters in the state will vote yes on a particular ballot measure.

(b)A survey was taken of the student body and the percentage of students which work full time was then calculated based on the survey.

(c)An insect invaded the grape crop in central California and much of the crop was destroyed. A study was done to estimate the total amount of crop damage for all grape farmers in central California.

I believe that A=inferential, b=descriptive, c=inferential. Am i correct?