The correct option is B Mesolecithal
Isolecithal egg has even distribution of yolk in the cytoplasm.
Mesolecithal egg has moderate amount of yolk.
Telolecithal egg has uneven distribution of yolk in the cytoplasm.
Centrolecithal egg has yolk which is concentrated at the center.
Frog is an amphibian and amphibians have mesolecithal type of egg.