In an ecosystem the producers may include
a. snakes, mice, and bacteria
b. vultures, rabbits, and fungi
c. grasses, shrubs, and algae
d. bacteria, insects, and birds

Option (C)

Explanation:

An ecosystem is defined as the group of biological community that interacts with the other non-living factors existing in an ecosystem. It is comprised of both biotic and abiotic factors. For example, marine ecosystem, terrestrial ecosystem, and aquatic ecosystem.

Producers are those that can prepare their own food, by carrying out the process of photosynthesis, in the presence of sunlight, carbon dioxide and water, and in return, liberates the food and oxygen that is responsible for the existence of all living organisms. Examples, trees, shrubs, grasses and algae.

These producers plays an important role in the ecosystem because they provide food to the consumers. The consumers are directly dependent on these producers.

In the given option, the producers are grasses, shrubs and algae.

Thus, the correct answer is option (C).