Why are saprophytes and parasites considered heterotrophs?

While a good number of saprophytes (e.g. many fungi) may possess plant-like traits, they are unable to produce their own food and therefore have to ingest organic compounds as their source of energy. It is for this reason that they are classified as heterotrophs

for the points

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!