Anand must be a vegetarian because he is a Buddhist. The argument assumes that

The argument “Anand must be a vegetarian because he is a Buddhist” presumes a universal generalization: that every Buddhist is a vegetarian. To infer a necessity (“must be”) from class membership requires the premise “all members of class X have property Y,” i.e., all Buddhists are vegetarians. Empirical and doctrinal sources show this universal claim is false or at least contested: Buddhist practice on diet varies (many are vegetarian but Buddhists are not uniformly so) [1], and early texts do not mandate vegetarianism for all followers [2]. Thus the assumed premise is the universal affirmative “all Buddhists are vegetarians” (option 2).

Sources

1. [1] https://indianexpress.com/article/india/many-in-buddhist-world-are-vegetarians-the-dalai-lama-meat-eating-4602292/
2. [2] https://archive.org/download/buddhism-engl/BUDDHISM%20ENGL.rar/BUDDHISM%20ENGL%2FBHANTE%2FETC%2FBHANTE%20DHAMMIKA%2FDhammika_To%20Eat%20or%20Not%20to%20Eat%20Meat.pdf