The answer is A. .For the first time in decades,Baby Boomers have been outnumbered by another group-the millennial.
In a sentence, a hook is the first one or two sentence that is used to grab the reader's attention toward he writing right from the batch.
The hook also introduced the main topic that wanted to be discussed within the writing itself.
I think it's "Pictures display information when written instructions are more complicated". Personally I believe it's just a majorly confusing way of saying: when the written instructions are too complicated they use pictures as well.
