The correct option is
B A - F, B - F, C - T, D - T
An ecosystem is a self-sustained stable unit formed by the interactions between the biotic (living) and abiotic (non-living) components that are comprised in it.
The interaction between biotic (living) and abiotic (non-living) components results in a physical structure that is characteristic of an ecosystem.
Stratification is a feature of the physical structure of an ecosystem.
It is the vertical distribution of different species occupying different levels in an ecosystem. ‘Strata’ in an ecosystem means ‘layers’.
Hence, statement A is false and statement C is true.
For example, in a forest ecosystem, the trees occupy the top vertical strata, shrubs occupy the second vertical strata and grasses occupy the bottom layers.
Hence, statement B is false and statement D is true.