What were muckrakers? A. City sanitation workers
B. A political party
C. Writers and journalists
O D. A labor union

I think it's C. Writers and journalists

Explanation:

The muckrakers were reform-minded journalists and writers in the Progressive Era in the United States who exposed established institutions and leaders as corrupt. They typically had large audiences in popular magazines.

ba geologist finds four sedimentary rock she determines that no geologic events have shifted the layers she labeles them a,b,c,dbfrom top to bottom

the of atp are the key to its ability to store and supply energy;

phosphate

the phosphate groups of atp are the key to its ability to store and supply energy. atp releases energy when it breaks bonds between its phosphate groups.