Honestly .B sounds the most right. If it's not that but I'm 99.9% sure it would be C.
Eat a potato pancake (latke)
Answer: Probabilistic
Explanation: This kind of sample is probabilistic, a random sampling. In this kind of sampling you select a group of students (in this case) among the totality of the high-schools that were randomly selected. This allows the investigation to be more trustworthy and accurate.