Your answer is CORRECT. Archaea that live by black smokers at hydrothermal vents under the ocean are often A) anaerobic due to the low oxygen content of the water in these locations B) barophilic C) psychrophilic D) Only A and B are correct E) Only B and C are correct

(A) is the correct option  

Explanation:

Hydrothermal vents, also known as deep sea vents are the aftermath of a volcanic eruption due to shifting of the plates that form the Earth’s crustBlack smokers are formed due to the high pressure at this depth and temperature of the trapped water because of which there is low oxygen content of water The black smokers emit fluids and causing it to emit chemicals such as sulfide, iron, copper and zincBarophiles are organisms whose survival and reproduction is optimized to high pressures, such as those in deep sea are microorganisms that can grow at 0 °C and below, have an optimum growth temperature close to  15 °C, and usually do not survive at temperatures above 20 °CThey are found in permanently cold environments such as the deep waters of the oceans and because they are active at low temperature, psychrophiles are important decomposers in cold climates

If it doesn't have a nucleus its a prokaryote