Refer to the given Venn diagram and select the incorrect statement regarding P, Q and R.

• A. R has three pairs of jointed legs which help it to walk, run and climb.
• B. Q has paired and unpaired fins that, help in movement in water.
• C. P has special air sacs connected to the lungs which aid in respiration process.
• D. Q is a shelled animal that possesses a muscular structure called foot which produces a series of wave like movements.