From the given options, select the one that rightly explains the given expression:
Rain cats and dogs

Rain very heavily

The idiom "rain cats and dogs" means to rain very heavily. The origin of this idiom is unknown, but there are several theories. One theory is that it comes from the fact that when it rains heavily, it can be difficult to see the ground, and it can seem like cats and dogs are falling from the sky. Another theory is that it comes from the fact that when it rains heavily, the sound of the rain can be like the sound of cats and dogs barking and howling.

The other options are incorrect. "Troublesome life in poverty" does not mean to rain very heavily. "Cats and dogs jumps down to play together in the rain" is not a common idiom, and it does not mean to rain very heavily. "Rain very lightly" is the opposite of "rain very heavily", so it is also incorrect.