These are the means and standard deviations for samples of building heights
in two different cities.

City A
Mean: 120 ft
Standard deviation: 20 ft

City B
Mean: 240 ft
Standard deviation: 12 ft

Select the two true statements.

A. City A's heights are more spread out than city B's heights.
B. City A's heights are less spread out than city B's heights.
c. City A has a lower average height than city B.
D. City A has a greater average height than city B.