Final answer:
The author does not directly respond to the claim regarding vegans and animal rights based on the evidence given. Instead, they focus on the ethical motivations behind veganism and the importance placed on animal husbandry exclusion. Additionally, vegans must be attentive to their protein sources to ensure they receive all essential amino acids from plant-based foods.
Step-by-step explanation:
In response to the claim that vegans give animals rights that they shouldn't have, the author does not specifically address this claim directly with any of the provided options (A to D). Rather, the discussion revolves around the philosophical reasons why vegans choose to avoid animal products and the pleasure derived by consumers from eating meat. This suggests that for many vegans, the rights of animals are more about ethical considerations than cost, health, or environmental impacts alone, as discussed by Purdy. The author cites Purdy's view on veganism, stating that the philosophy of many vegans is not rooted in sustainability but in the principle of excluding animal husbandry completely.
Concerning the question surrounding proteins in a vegan diet, it is important for vegans to pay special attention to the protein they consume because, as indicated by option (b), it is more difficult to obtain all essential amino acids from single plant sources. While option (a) incorrectly suggests that plant proteins contain all essential and non-essential amino acids, option (d) is not true as plant proteins do contain essential amino acids, although not always in the same proportion as found in animal sources. Therefore, vegans must carefully select a combination of plant-based proteins to ensure they receive a complete amino acid profile necessary for their dietary needs.