1. New trends in technology have increased workers’ <u>A. mobility</u> like never before; now many jobs can be done from anywhere, as long as you have the right tools.
Mobility is a noun that refers to the ability to move easily, which is what the sentence is referring to: New trends in technology have increased the ability or capacity of workers to move easily or freely.
2. How the Other Half Lives, a book by Jacob Riis in 1890, helped to spread <u>B. altruistic</u> ideas in the United States.
In order to make sense, the missing word of the sentence has to be an adjective so that it can describe the noun "ideas".
"Altruistic" is the right answer because it is an adjective. "Altruism" is incorrect because it is a noun and "Alutristically" isn't even a word, the correct word would be "Altruistically", however it still doesn't fit in the sentence because it's an adverb.
