Why Are Birds That Inhabit Areas with High Acid Deposition

Multiple Choice

Why are birds that inhabit areas with high acid deposition more likely to lay eggs with thin shells?

A) acid deposition increases the effects of DDT which has already been implicated in thinning eggshells.
B) high rates of cancer due to acid deposition impact birds' ability to form eggs.
C) acid deposition acts as an endocrine disruptor that interferes with reproductive hormones in bird species.
D) in acidic soils calcium, an important nutrient for eggshell production, washes away and so less is available to birds in their diets