Final answer:
The question involves applying Newton's second law to find the acceleration of a system including two blocks and a frictionless pulley, a classic high school level physics problem.
Step-by-step explanation:
The subject of the question is Physics, specifically related to the topic of mechanics and dynamics. The grade level is most likely High School, as the concepts involved, such as frictionless pulleys, inclined planes, and simple Newtonian mechanics, are typically covered at this level.
To find the acceleration of Block B in the given scenario, we would need to apply Newton's second law of motion and consider the forces along the incline, as well as the gravitational force acting on Block B. The fact that surfaces are considered smooth in the scenario indicates that we're ignoring the effects of friction. In general, problems like these require an understanding of force diagrams and the ability to write down and solve systems of equations that arise from applying Newton's laws.