Answer:
Option B, Divergent Boundary
Explanation:
The tectonic plates moving around form the divergent boundary and at this boundary magma from inside the earth rises to form new crust on the lithosphere beneath the water. Most of the divergent plate boundaries are present below the water where they form oceanic spreading ridges (submarine mountain ranges). The process of formation of oceanic spreading ridges is volcanic. 
Hence, option B is correct
 
        
             
        
        
        
The difference between analog and digital signals is that an analog signal is a continuous electrical message while digital is a series of values that represent information. Analog is conveyed by electrical current variations.
        
                    
             
        
        
        
Fluid filled sacs in the knee are specifically called Bursa or Bursae. Bursae is plural for Bursa.
A bursa is a closed fluid filled sac that function as a gliding surface to reduce friction between tissues of the body. Knee bursitis occurs when there is irritation or inflammation in one one of the knee bursa. The procedure of removing fluid-filled sac is called bursectomy. When the bursa become infected with bacteria, this condition is called septic bursitis.
        
             
        
        
        
Phototropism, Gravitropism, Thigmotropism, <span>Hydrotropism and Heliotropism</span>