If the incoming wave strikes a barrier at a 90 degree angle, the wave energyis back at oncoming waves making the next wave back at oncoming waves not effecting them.

bounced back at oncoming waves

If the incoming wave strikes a barrier at a 90 degree angle, the wave energy is, in fact bouncing back at oncoming waves.

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in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

d is the correct answer