单选题 According to the model presented in the passage, which of the following normally determines the initial height of a tsunami?

• (A) The speed of the crustal plates that slip along each other in the imaginary fault plane
• (B) The vertical motion of the sea floor where the tsunami generates
• (C) The orientation of the assumed fault plane
• (D) The degree of refraction and shoaling
• (E) The presence of bumps and grooves on the seafloor