B. because the work in one area and are specialized to do that work.
Subsistence crops are grown for the direct benefit of the farmer and their family. Cash crops are grown to deliberately be sold. ... Cotton makes a poor subsistence crop because you can't eat it and it has to be processed before it's useful (ginned, spun and woven)
Over speculation means to over "guess." eg, majority of the people feel the stock market will go up, so they greedily buy, when in reality it's the peak already and stock market prices will drop soon.
