Which of the Following Statements Regarding Vectors and Representation of Movement

Multiple Choice

Which of the following statements regarding vectors and representation of movement forces is true?

A) For internal forces, the tail of the arrow lies at the muscle attachment on the moving lever of the muscle exerting the force.
B) Gravity is only depicted as a vertical arrow with the tail of the arrow originating behind a point at about S2.
C) Muscle contraction force is depicted with an arrow pointing opposite the combined effect of the muscle fibers.
D) The arrow on the vector is straight and points in the direction away from force exertion.