A Tree Grows Wider Each Year Because of ________

Multiple Choice

A tree grows wider each year because of ________.

A) apical meristem, but not vascular cambium nor cork cambium
B) vascular cambium, but not apical meristem nor cork cambium
C) vascular cambium and cork cambium, but not apical meristem
D) apical meristem, vascular cambium, and cork cambium