I want to compare the percentage of people who are fully vaccinated for COVID-19 in Berkeley (population about 121,000) and Oakland (population about 425,000). Looking only at the effect of sample size on accuracy, which will give me approximately the same level of accuracy in both cities?

Circle one:

Sample more people in Berkeley

Sample more people in Oakland

Sample the same number of people in Berkeley and Oakland

Now justify your answer in one sentence: