This question features an argument based on an assumption about a group, in this case Buddhists.

Option 1, "most Buddhists are vegetarians" could be the assumption made in the argument. However, the argument states `Anand must be a vegetarian because he is a Buddhist` which implies that being a Buddhist equates to being a vegetarian. A stronger assumption is given in option 2.

Option 2, "all Buddhists are vegetarians", matches the logic of the statement better because it suggests every Buddhist, including Anand, is a vegetarian. This is the assumption made in the argument and appears to be a more accurate answer.

Option 3, "only Buddhists are vegetarians", is incorrect as the argument doesn`t say that only Buddhists can be vegetarians.

Option 4, "most vegetarians are Buddhists", is not what the argument assumes. It`s about Anand being a vegetarian because he`s a Buddhist, not the other way round.

Alert - correct answer should be option 2: all Buddhists are vegetarians.