Which of the Following Statements Is Correct About Generalising the Findings

Which of the following statements is correct about generalising the findings of a study to the general population,based on particular samples?

A) It is not possible to make generalisations unless you study the entire population.
B) It is possible to make generalisations as long as the sample is representative of the population.
C) It is possible to make generalisations as long as the sample includes at least 50 per cent of the population.
D) It is possible to make generalisations if the sample is representative, and its size allows statistical inferences to be made.