Answer:
Explanation:
B. Stratified random sample.
To control for the possibility of different reactions based on gender, a stratified random sample should be utilized. This type of sample involves dividing the population into subgroups or strata based on some relevant characteristic, such as gender in this case. Then, a random sample is drawn from each stratum in proportion to the size of the stratum. This ensures that each stratum is represented in the sample and reduces the chance of sampling bias.
A self-selecting sample would not be appropriate as it allows individuals to choose whether or not to participate in the study, which may introduce bias as those who choose to participate may not be representative of the population as a whole. A systematic sample involves selecting individuals at regular intervals from a population, which may not be effective in ensuring a representative sample if there are patterns or trends in the population.