Answer:
B. Better measure of center: the median.
D. Better measure of spread: the interquartile range (IQR).
Explanation:
The median is a measure of central tendency. Specifically, it indicates the central value of a data set, the value that is at the exact center, that is the median. That's why the median is the best measure of center for a data set.
On the other hand, the interquartile range is the difference between the first quartile and the third quartile, that is, the first and last quartile, this difference represent better the spread, because it shows the variability of the data set. This variability measure makes the interquartile range the best option of represent spread.