Answer:
A). Gregor's mother sees him and runs screaming from the room.
Explanation:
'The Metamorphosis' by Franz Kafka is 'magical realist' text that proposes a rational view to the modern world through the portrayal of 'Gregor and his family' with a dash of magical elements.
As per the question, option A displays the example that most clearly assists Kafka to establish the theme of isolation or alienation as when 'Gregor's mother scream and run after seeing Gregor' implies the internal split in the family that leaves him completely shattered and isolated. Thus, option A is the correct answer.
