OG12 CR 50的 assumption 取非你能解释吗？

我是这样想的 其实取非的思想是很没劲的 不知道新东方为什么把它讲的那么复杂
取非的最根本的思想就是本来有个assumption 就是中间的某种逻辑 这个逻辑使前后能够更好的联系起来 一旦取非 即否定了这种逻辑 可以产生weaken的效果 所以说新东方所说的取非其实是讲暗示的 正确的那个逻辑打破（就是说这个逻辑不对）
现在来看这句话的逻辑是什么 C选项中前半句中的do not是对children的修饰 我觉得不应该非它 因此非后面 而后面的at least是真正重要的部分 即逻辑的重心吗 我觉得不是some才是 因此可以不看at least 原句表达依然完整 所以非的是some
个人看法 参考吧

C 取非之后的确应该非在at least some time 上，所以就变成 那些不把所有课后时间用来玩电脑游戏的孩子也不会跟别人交谈   对原文的结论：把所有课后时间用来打游戏的孩子比其他孩子少与别人交谈了  起到了削弱作用   意思就是：课后时间打游戏对于交谈与否根本无影响，所以就否定了原文结论了  

这题很类似于OG12-SC 38题    那些非法盗版的人对于整个行业的损失是小的，因为不管购买是不是获取软件的唯一途径，那些非法盗版的人都不会买（即行业说的“损失”的那部分钱压根就跟非法盗版的人没有关系，因为这部分钱就不属于行业损失的，是压根赚不到的）

Although computers can enhance people's ability to communicate, computer games are a cause of
underdeveloped communication skills in children. After-school hours spent playing computer games are
hours not spent talking with people. Therefore, children who spend all their spare time playing these games
have less experience in interpersonal communication than other children have.
The argument depends on which of the following assumptions?
(A) Passive activities such as watching television and listening to music do not hinder the development of
communication skills in children.
(B) Most children have other opportunities, in addition to after-school hours, in which they can choose whether
to play computer games or to interact with other people.
(C) Children who do not spend all of their after-school hours playing computer games spend at least some of
that time talking with other people.
(D) Formal instruction contributes little or nothing to children's acquisition of communication skills.
(E) The mental skills developed through playing computer games do not contribute significantly to children's
intellectual development.

(C)

请问这题C取非  也就是这句取非 spend at least some of that time  得到是much time or no time?
倒着推应该是选 much time, 但我不太明白他们的中文逻辑

at least some of that time  的中文意思 是至少有些时间吧， 那它的反义是很多时间还是很少时间，我就转不过来了。

请大家帮我解析一下。