Read the excerpt from The Evolution of Useful Things. Clearly, existing means of masking had serious flaws. One day, when he was dropping off a batch of waterproof sandpaper, Drew overheard some body-shop workers cursing two-tone painting. The young technician, who had studied engineering through correspondence-school courses, promised he would make something to solve the problem. This paragraph helps develop the central idea of persevering through failure to achieve successful new inventions by indicating that solutions are often discovered by chance. revealing the seriousness of the situation Drew faced. presenting Drew's capability and determination. showing why people are never truly satisfied.