Answer:
A). Scientific studies show little or no difference in the health of herds treated with rbST and untreated herds.
Step-by-step explanation:
A logical argument is described as an argument that proposes sufficient evidence to support its claim and acts as a guide to create new statements and drive the argument to reach a constructive conclusion.
In the given question, option A illustrate a logical argument as it offers a proposition 'little or no difference in the health of herds treated with rbST and untreated herds' with the evidential support ('scientific studies') to substantiate its claim and invokes further argument(to attain a conclusion). It functions to lead the argument/discussion that would drive the discussion forward in order to reach a conclusion or judgment about rbST. Thus, option A is the correct answer.