What does the word advantage mean as it is used in the sentence

How and why did the 27th amendment modify the authority of congress to set its own pay

According to the chart, the power to tax is a concurrent power, meaning a) it belongs to the state government. b) it is a government power that is shared. c) it is less important than the power to borrow money. eliminate d) it is more important than the regulating state trade.

Who was put in the concentration camps? and why