Strontium, sr (number 38), is especially dangerous to humans because it tends to accumulate in calci

Strontium, Sr (Number 38), is especially dangerous to humans because it tends to accumulate in calcium-dependent bone marrow tissues [calcium (Ca), number 20]. This fact relates to the organizations of the periodic table in that strontium and calcium are both:

A. The common names are shorter and easier to pronounce
B. These compounds are encountered frequently
C. The common names are more widely known
D. All of the above