Final answer:
The sentence 'Black soldiers served in artillery and infantry and performed all noncombat support functions that sustain an army, as well.' doesn't indicate discrimination like the other options, making it the correct answer that does not support the point of black soldiers facing discrimination.
Step-by-step explanation:
All the sentences except for option (a) "Black soldiers served in artillery and infantry and performed all noncombat support functions that sustain an army, as well." support the author's point that black soldiers faced discrimination. This sentence doesn't indicate discrimination; rather, it shows that black soldiers had a role in both combat and support functions. In contrast, the other sentences describe various forms of discrimination faced by black soldiers, such as being underpaid (c), not being used in combat extensively due to prejudice (b) and receiving harsher treatment as captives (d).