Answer:
The correct option is a) are decomposers
Step-by-step explanation:
Decomposers can be described as organisms which feed on dead and decaying material. These organisms break down molecules and use them as a source of food. Among the options mentioned, the option of decomposers is the only one which is applicable to fungus like protists and is unique to it. On the other hand, Plant like protists make their own food by the process of photosynthesis. Hence, option A is correct.