Which excerpt from "Creepy, Crawly Healers" uses a problem-and-solution structure?

"Scientists performed a study in 1989 and discovered that maggots were safe and
useful."

"Since scientists know that spider silk has
benefits, it is being developed in a lab."

"In the late twentieth century, maggots were used only when modern practices
failed to heal a wound."

"A company in Britain has created a leech farm. It supplies leeches to doctors all over the world.”

Healthcare costs are becoming an issue for many americans. in just two years, the average family has seen an increase of 3 percent in insurance costs. the increase rises to 25 percent when you include families who buy insurance on an exchange. at this rate, health care will soon be completely unaffordable for most americans. therefore, lowering the cost of health insurance must be a priority for lawmakers. which statement best explains why the argument is logical? a.)the argument incorporates empirical and anecdotal evidence. b.)the argument includes a strong counterclaim and a fair rebuttal. c.)the argument contains relevant reasons supported with facts and data. d.)the argument includes a personal experience as an emotional appeal.