The sporophyte of $Riccia$ is

Bryophytes are called the amphibians of the plant kingdom because:

Bryophytes resemble algae in the following aspects:

The dehiscence of a moss capsule takes place by the rupture of:

Given below are two statements: One labelled as Assertion $A$ and the other labelled as Reason $R$:
Assertion $A$: The first stage of gametophyte in the life cycle of moss is protonema stage.
Reason $R$: Protonema develops directly from spores produced in capsule.
In the light of the above statements,choose the most appropriate answer from options given below:

Which of the following is true for the sporophyte stage of $Riccia$?