Answer: D. grasses and shrubs to guanacos to pumas
Step-by-step explanation:
An ecosystem simply means group of organisms living and interacting with one another in an environment.
The energy flow in an ecosystem that contains grasses and shrubs, pumas, and guanacos would be grasses and shrubs to guanacos to pumas.
This shows that the grass is the starting point as the energy provider, after which the shrub get its energy from the grass. The guanacos eats shrub and the pumas eats the guanacos. Thus how's how energy is being transferred from one organism to another.