Which one of the following organisms is dependent on saprophytic mode

Which one of the following organisms is dependent on saprophytic mode of nutrition?

Agaricus
Ulothrix
Riccia
Cladophora
This question was previously asked in
UPSC CDS-1 – 2019
Agaricus is a genus of fungi, commonly known as mushrooms. Fungi are heterotrophic organisms that obtain nutrients by absorption. Many fungi, including Agaricus, are saprophytic, meaning they feed on dead and decaying organic matter.
Saprophytic nutrition involves obtaining nutrients from dead organic material. Fungi are often saprophytic.
Ulothrix and Cladophora are green algae, which are photosynthetic and therefore autotrophic. Riccia is a liverwort, a type of bryophyte, which is also photosynthetic and autotrophic.