It does not take a large electric current, the amount of charge that passes through a substance each second, to cause a fatal shock. The smallest deadly amount of electricity through the human body is 100 mA (milliamperes). What is this current in amperes?

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

your answer is c! hope this : )