Generally,​ ​coral​ ​reefs​ ​are​ ​found​ ​in​ ​shallow​ ​waters​ ​between​ ​​ ​degrees​ ​N​ ​latitude and​ ​​ ​degrees​ ​S​ ​latitude.

30 degrees;

30 degrees

Explanation:

Coral reefs are formed when the skeleton of the corals merge and combine with each other. The formation of coral reefs takes many years . Corals are the organism living in the ocean. They live in dense colonies and clusters. Coral reefs provides an ecosystem for other marine organisms to live in. The species live in the coral reefs and maintain their population. Corals live in the region of the ocean that has warm water and between the latitudes of 30 degrees North and 30 degrees South.

i think it’s c but i might be wrong. if i am let me know! have a good rest of your day as well!