CR: Weak/Flawed Assumption Problem

[nishant1309]

A light bulb company produces 2,000 light bulbs per week. The manager wants to ensure that standards of quality remain constant from week to week. The manager, therefore, claims that out of 2,000 light bulbs produced per week, 500 light bulbs are rejected.
Of the following, the best criticism of the manager's plan is that the plan assumes that

(A) light bulb manufacturers cannot accept all light bulbs that produced
(B) the overall quality of the light bulbs would not be improved if the total number of light bulbs produced were reduced
(C) each light bulb that is reviewed is worthy of being reviewed
(D) it is difficult to judge the quality of a light bulb
(E) the 1,500 light bulbs that are accepted will be of the same quality from week to week

OA after some reasonable explanations.

[hoji]

It is clearly E.
it is a defender: the rest bulbs wont be in bad quality, i.e they will be in good quality.
A is not an assumption of the manager