Select the correct answer. Fin plans to present her paper about Nemo's Garden to a kindergarten class. She wants to change this sentence:

One example of scientists working to make people’s lives better is through their development of underwater greenhouses, a sustainable method for producing food.

How should the sentence be revised to have a less formal tone?

A.
Scientists are using underwater greenhouses to grow food for people all over the world.
B.
Growing plants in immense underwater greenhouses will ensure there is a continuous food supply.
C.
The development of underwater greenhouses is a remarkable scientific accomplishment.
D.
There are numerous examples of the ways scientists work to make people's lives better.