The answer is A. The eggs do not have a shell to prevent water loss.
Toad's eggs do not have a shell, like reptile eggs or bird eggs. Shell is important because it protects eggs from drying out if they are laid in the land. Toads lay eggs in a jelly-like glycoprotein. Thanks to glycoprotein around toad's eggs, contact with water is maintained all the time so that eggs don't die.
