Which of the following statements regarding frog is not correct?

A. Fertilization is external and takes place in water.

B. External ear and tympanum can be seen externally.

C. In females the ureters and oviduct open separately in the cloaca.

D. Copulatory pad on the first digit of the fore limbs and vocal sac are present in male frog.

Please do not use chat terms. Example: avoid using "grt" instead of "great".