What would be more challenging being mother of 21st century or being a daughter of 21st century?

It depends.

Explanation:

The answer to this question is impossible to give with the information given. No two families are the same so you cannot speak for everyone. For instance, if someone's mother is bed-ridden and the daughter is taking care of her, the answer would he the daughter, but if in a different family everyone is healthy and they face no additional challenges outside of what is normal and the mother has a daughter(s) than the answer is the mother. In conclusion there is too much variation to make a concrete answer for that question.

omg wow lol

explanation:

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."