The argument:
Accepts the fact that the tea has some healthy ingredients.
Then introduces another verifiable fact: caffeine reduces healthfulness.
Uses that to challenge the claim that the tea is healthy.
It is not building a theory or using a subjective or arguable claim — it's using a stated, factual property (caffeine makes milk unhealthy) to question another health claim.
(A) Citing a claim to prove a point
→ The argument isn’t proving a new point — it’s challenging an existing one.
(B) Citing an example to establish a theory
→ It gives an example (milk + caffeine) but doesn’t try to build a new theory. It uses it to attack the brand’s claim.
(C) Citing a claim to disprove a theory
→ No actual theory is being disproven — it’s a marketing claim (the tea is healthy), not a theory.
(D) Leveraging on the veracity of a cited fact to challenge a claim
✅ Correct.
This precisely fits:
The verifiable fact: caffeine makes milk unhealthy.
Is used to challenge the tea brand’s “healthy” claim.
(E) Leveraging on an arguable claim to challenge a claim
→ The argument does not rely on an arguable claim. It uses a strong example assumed to be true and verifiable.