What are photoautotrophs?

What are autotrophs?

There are four organisms A, B, C and D. The organism A eats only the flesh of other animals as food. The organism B can eat grains, fruits and vegetables as well as meat and fish. The organism C can make the food itself from simple inorganic substances present in the environment by utilising sunlight energy. On the other hand, organism D eats only plants and their products as food.

Which organism (C or D) can be a producer?

Write the quadrants in which the following points lie:

$\left(-4,7\right)$