Here are the correct definitions for each keyword:
Spread: C. The extent to which values in a data set vary, either from one another or from the center.
Quartile: D. One possible measure of spread, based on dividing a dataset into four parts. The values that divide each part are called the first quartile (Q1), the median, and the third quartile (Q3). IQR is calculated as Q3 minus Q1.