<span>The question is asking us "What is labor in economics?" and among the options, the best answer is that Labor is one of the three resources of production, like land or capital. Labor cannot be irrelevant for economics, since it can be bought for example, and since it has a value. it can also be exchanged for capital - when workers are being paid money for their labour.</span>
they needed more raw materials to fuel their mass production and population growth. they would exploit natural resources and fight for what they could get. if that makes any sense