The correct option is B Ecballium
Ecballium elaterium, also called as the squirting cucumber or exploding cucumber (but not to be confused with Cyclanthera explodens), is a plant in the cucumber family. It gets its unusual name from the fact that, when ripe, it squirts a stream of mucilaginous liquid containing its seeds, which can be seen with the naked eye.
Cucurbita, Nicotianna and Calotropis is not known as squirting cucumber.
Therefore, the correct answer is option B.