Lack of sunlight will directly affect the formation of

Vitamin D3

Explanation:

Bone resorption is a process whereby bone matrix is destroyed by substances released by osteoclasts.

Bone resorption may occur when blood calcium levels are low.

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

it is either c or d and i know for sure it is not a or b