To obtain a smaller margin of error. a. choose a larger confidence level. b. choose a smaller confidence level.

(A) Choose a larger confidence level.

Explanation:

Margin of error shows the percentage difference between your result and the real population. Margin of error expresses the amount of random sampling error in a survey's results. The smaller the margin of error, the larger the confidence level one should have that the poll's reported results are close to the true figures and vice versa. So to obtain a smaller margin of error, one needs to choose a larger confidence level.