Here's a problem to solve: Since Earth radiates heat into outer space, why is Earth's surface not becoming colder?

Among the 4 following options, which is the correct answer?

- A: Earth constantly takes in more heat from the Sun.
 
- B: Earth has forests that provide heat through photosynthesis.
 
- C: Earth has oceans that store heat.
 
- D: Earth absorbs extra heat from molten lava.
 