How was the method of making pottery by using coils of clay better than simply shaping the clay by hand?

The correct answer is C) it prevented pottery from cracking when fired.

The method of making pottery by using coils of clay was better than simply shaping the clay by hand in that this method prevented pottery from cracking when fired.

The coil method is when coils of clay are used to be bowls of different sizes and shapes. With your fingers flat, you roll into ropes1/4 or 1/2 thick to create the piece of pottery to you want. You keep adding the coils you need. The other methods of working with clay are Pinch Pots and the Slab method.

The other options of the question were a) the pottery could be cut or stamped with designs, b) it created a watertight seal and d) it produced more attractive pottery.

d. migration

since most of current immigration into the u.s., both legal and illegal, is coming from latin america. it would be very difficult to imagine or rationalize a country my fellow citizens are trying desperately to flee into, would pose a threat to my prosperity or freedom. since the u.s. has a long history of intervention, but no record of permanent occupation, i would not feel oppression is the main objective.  

the largest free trade nation, along with the largest gdp in the world wanting to expand it's economic policy on us, and including us, could only be positive. the u.s. government has no interest in, or way of simply forcing american culture on us. and has no track record of it. other nations that adopted american social culture, or "americanization" did so voluntarily, mainly through the choice of allowing american businesses and u.s. citizens to come into their nations, as free operatives.