In Magnesium-Deficient Plants the Older Leaves Show More Severe Symptoms

In magnesium-deficient plants the older leaves show more severe symptoms of chlorosis than younger leaves.What is the best explanation?

A) There is more time for the symptoms to develop in older leaves.
B) Chlorophyll is transported from the older leaves to the younger leaves.
C) Magnesium is more soluble in younger leaves.
D) Scarce magnesium is removed from older leaves and translocated to support younger,more active leaves.
E) Older leaves need less chlorophyll.