I need help with this

Even though there are many positive effects of the Neolithic Revolution, there are some negative effects. Since there were no refrigerators back then (at least in the summer) when the early humans would store food for long period of time, the food would most likely mold and become non-edible. While domesticating animals the early humans contracted sometimes deathly diseases and illnesses. Also if the weather was bad for crops one year or more, the people would starve until the next season for the crops or until they could go hunting.

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b

the answer to your question is true