Summer Wood Can Be Distinguished from Spring Wood Because Summer

Summer wood can be distinguished from spring wood because summer wood

A) contains wide vessels with thin walls, and is lighter than spring wood.
B) is impregnated with suberin, whereas spring wood is not.
C) contains thick-walled tracheids that give it strength, and is more dense than spring wood.
D) contains only thin-walled xylem, and is lighter than spring wood.
E) is produced during the summer when moisture is plentiful, and contains only heavy fibers and thick-walled tracheids.