According to the Variations of the Social Model Rooted in Marxism

According to the variations of the social model rooted in Marxism, why is disability linked with exclusionary practices?

A) Those who are impaired do not comprise an important segment of the consumer market.
B) Those who are impaired are seen as labour that cannot be exploited.
C) Those who are impaired face harsh competition from their non-impaired counterparts in the labour movement.
D) Those who are impaired have a greater sense of solidarity with others.
E) Those who are impaired are unlikely to be capitalists, therefore they lack social power.