Answer: D. Heat
Explanation : Water Vapor is a source of warmth, since the heat that is radiated from Earth is absorbed by the water vapor. This is why greenhouses use water vapor as well.
Characteristics of Eukaryotic Cells - Boundless
https://www.boundless.com/biology/textbooks/boundless-biology-textbook/cell-structure-4/eukaryotic-cells-60/characteristics-of-eukaryotic-cells-313-11446/
Like a prokaryotic cell, a eukaryotic cell has a plasma membrane, cytoplasm, and ribosomes. However, unlike prokaryotic cells, eukaryotic cells have: a membrane-bound nucleus. numerous membrane-bound organelles (including the endoplasmic reticulum, Golgi apparatus, chloroplasts, and mitochondria)
In order to create energy from oxygen, the cells must undergo a process called cellular respiration which occurs in the mitochondria. The mitochondrion will use the oxygen, along with glucose, to create carbon dioxide, water, and energy.
I think its b or c im 80.99% sure