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The gametophyte is not an independent, free-living generation in
A
$Pinus$
B
$Polytrichum$
C
$Adiantum$
D
$Marchantia$
Detailed Solution
$Pinus$ is a gymnosperm. In gymnosperms the male and female gametophytes do not have an independent, free-living existence.
The male gametophyte is confined to the pollen grain and the female gametophyte is retained within the megasporangium (ovule) on the sporophyte.
$Polytrichum$ (a moss) and $Marchantia$ (a liverwort) are bryophytes, in which the gametophyte is the main, free-living plant body.
$Adiantum$ is a fern, in which the gametophyte is a small but free-living, photosynthetic prothallus.
Hence the gametophyte is not independent in $Pinus$.
The male gametophyte is confined to the pollen grain and the female gametophyte is retained within the megasporangium (ovule) on the sporophyte.
$Polytrichum$ (a moss) and $Marchantia$ (a liverwort) are bryophytes, in which the gametophyte is the main, free-living plant body.
$Adiantum$ is a fern, in which the gametophyte is a small but free-living, photosynthetic prothallus.
Hence the gametophyte is not independent in $Pinus$.