In Assessing the Effectiveness of a Market Segmentation Approach, Measurability

In assessing the effectiveness of a market segmentation approach, measurability

A) is the degree to which individual market segments are easy to identify and measure
B) is the degree to which a segment is large enough and profitable enough to warrant investment
C) is the degree to which segment consumer preferences are stable over time
D) is the ability to communicate with and reach the target market