The central idea conveyed by the use of sensory and kinesthetic imagery in the sentence is:
D. Ona finds a bungalow that is falling apart but feels safer there than where she was before.
The imagery of the "missing two walls" and the birch tree growing through the bungalow suggests an environment that has seen better days, yet Ona settles there, indicating that she perceives it as a safer option compared to her previous situation.