Which of the following is responsible for peat formation?

Options

A. Sphagnum
B. Marchantia
C. Riccia
D. Funaria

Answer

**Step-by-Step Solution:**

1. **Identify the Options:** The question provides four options: Fagnum, Mercantia, Rechia, and Funaria.

2. **Understand Peat Formation:** Peat is an accumulation of partially decayed organic matter, primarily found in waterlogged conditions. It is an important precursor to coal formation.

3. **Recognize the Key Organism:** Among the options, Fagnum (also known as Sphagnum) is a type of moss that thrives in wet, acidic environments and is known for its role in peat formation.

4. **Explain the Process:** When Fagnum moss grows and dies in waterlogged conditions, it does not fully decompose due to the lack of oxygen. Over time, layers of this moss accumulate and compact under pressure, eventually forming peat.

5. **Conclusion:** Based on the understanding of the options and the process of peat formation, the correct answer is Fagnum.

**Final Answer:** Fagnum is responsible for peat formation.

---