The correct options are
A Frog: Skin
B Earthworm: Skin
C Rose plant: Stomata
The earthworm breathes through its moist skin. Here oxygen and carbon dioxide dissolve and are then exchanged through the skin. Frogs breathe through their skin underwater. In plants, gas exchange occurs through leaves. The exchange of oxygen and carbon dioxide in the leaf (as well as the loss of water vapour in transpiration) occurs through pores called stomata.