Strontium-90 from Nuclear Fallout Is a Potential Major Long-Term Human

Strontium-90 from nuclear fallout is a potential major long-term human health threat because

A) it is chemically similar to calcium, has a relatively long half-life, and is incorporated into bone.
B) it is chemically similar to calcium, has a relatively short half-life, and is incorporated into breast milk.
C) it is chemically similar to sodium, has a relatively long half-life, and collects in the liver.
D) it is chemically similar to sodium, has a relatively short half-life, and collects in the heart.