Low calorie sweetners

I believer that option A is also weakining the argument......Am I right?.....

Please explain this one


Statistics show that although consumption of
low-calorie, alternative sweeteners has gone up
in each of the past five years, so has the
percentage of the population that is obese.
According to sugar manufacturers, this shows
that the low-calorie, alternative sweeteners are
not effective weight loss aids.
Which of the following assertions, if true, would
most weaken the sugar manufacturers'
conclusion?

(A) Many people who use low-calorie,
alternative sweeteners eat some foods
that are not low-calorie.
(B) Some low-calorie, alternative sweeteners
can increase the appetite, making a
person eat more than he or she normally
would.
(C) Many people use low-calorie, alternative
sweeteners to accompany a wellbalanced,
low-calorie diet.
(D) Obesity has declined among people who
have consistently used low-calorie,
alternative sweeteners.
(E) The rise in the consumption of low-calorie,
alternative sweeteners is primarily due to
an increase in the number of users rather
than an increase in the amount each user
consume