Based on the preceding results, is the sample median an unbiased estimator of the population median? Why or why not?

A. The sample median targets the population median. As such, the sample median makes a good estimator of the population median.

B. The sample median does not target the population median. As such, the sample median makes a good estimator of the population median.

C. The sample median does not target the population median. As such, the sample median does not make a good estimator of the population median.

D. The sample median targets the population median. As such, the sample median does not make a good estimator of the population median.

I think it is either B or C, but I am confused on what makes the sample median a good or bad estimator.