题目内容：
根据以下资料，回答题：Like land, labor is means of production．In nonindustrial societies, access to both land and labor comesthrough social links such as kinship, marriage, and descent．Mutual aid in production is merely one aspect ofongoing social relationships that are expressed on many other occasions．
Nonindustrial societies contrast with industrial nations in regard to another means of production--technology．In bands and tribes manufacturing is often linked to age and gender．Women may weave and men make potteryor vice versa．Most people of a particular age and gender share the technical knowledge associated with that ageand gender．If married women customarily make baskets, most married women know how to make baskets．Neithertechnology nor technical knowledge is as specialized as it is in states．
However, some tribal societies do promote specialization．Among the Yanomani of Benezuela and Brazil, forinstance, certain villages manufacture clay pots and others make hammocks．They don't specialize, as one mightsuppose, because certain raw materials happen to be available near particular village．Clay suitable for pots iswidely available．Everyone knows how to make pots, but not everybody do~s so．Craft specialization reflects thesocial and political environment rather than the natural environment．Such specialization promotes wade, which isthe first step in creating an alliance with enemy villages．Specialization contributes to keeping the peace, althoughit has not prevented inter-village warfare．
Among the Trobriand Islanders of the South Pacific, Malinowski found that only two out of several villagesmanufactured certain ceremonial items that were important in a regional exchange network called the kula ring．Asamong the Yanomani, this specialization was unrelated to the location of raw materials．We don't know why thisspecialization began, but we do know that it persisted within the kula ring, which allied several communities andisland in a common trade network．
In nonindustrial societies, how do people obtain the means of production? A．By land and labor．
B．Through social links．
C．By mutual aid．
D．By many other occasions．
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