Final answer:
Sohrab's defeat of Assef is significant because it represents the new generation's triumph, Sohrab's personal reclaiming of dignity, and his avenging of his father Hassan's death, fulfilling all aspects of option (D) All of the above.
Step-by-step explanation:
The significance of Sohrab being the one who stops Assef is profound for various reasons, which collectively address socio-cultural and personal dimensions of redemption and hope. Firstly, Sohrab represents the new generation of Afghanistan, and as he overcomes Assef, it is seen as a symbolic triumph of a hopeful future over the corrupt and violent past. Secondly, as a direct victim of Assef's abuse, Sohrab's act serves as a pivotal instance of reclaiming his power and dignity, confronting his abuser directly. Lastly, Sohrab being the son of Hassan, his actions serve as a poignant retribution for his father's sufferings and death at the hands of Assef. Therefore, the answer to why Sohrab stopping Assef is significant is (D) All of the above, as each aspect contributes to the overall portrayal of justice and the potential of new beginnings.