Answer:
Sample: 35 residents surveyed; Population: all residents of the city.
Explanation:
In statistics, population refers to the entire group of objects, people, events, any that can be measured. The main characteristics is that population englobes everything.
On the other hand, a sample refers to a sub-set of the population, which must represent it. The main thing about a sample is that it must be representative of the population, otherwise it doesn't work.
So, in this case, we are talking about a survey, that means the population are wall the residents of the city, that's the major set of subjects. And the sample is all 35 people that were surveyed, the represents a sub-set of the population.
Therefore, the right answer is the thid choice.