The correct option is B Ova
In female frog, on each side of the ovary there is a long much coiled whitish glandular tube called oviduct or Mullerian duct. At the anterior end of each oviduct there is an oviducal funnel with a wide aperture called ostium.. The posterior part of the oviduct dilates to form a thin walled ciliated ovisac , where the ova are stored and agglutinated.
So, the correct answer is 'Ova'.