Which lists only metalloids

C

Explanation:

Boron, germanium, and tellurium are all metalloids because they are not fully metal.

b

Explanation:

(Po) antimony (Sb), tellurium (Te), and gallium(Ga) boron (B), germanium (Ge), and tellurium (Te) polonium (Po), aluminum (Al), and silicon (Si)

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

i have no clue hope you find the answer