Read this excerpt from "Famine Is a Feminist Issue."

That's why empowering women is now one of the main solutions for feeding the world. Globablly, most countries have achieved a birth rate at replacement levels, about two children per woman. But in sub-Saharan Africa, the [birth] rate is 5.6 children per woman, largely because girls are not aware of reproductive choices and drop out of school at a young age and have kids. [Birth] rates are highest in countries where women don't have access to birth control or maternal and child health care. Babies often die before they turn five years old, and mothers overcompensate in family planning in hopes that at least a few kids will survive to adulthood. Unless the status of women changes in sub-Saharan Africa, we're going to have a lot more than one billion hungry by midcentury.

Which sentence from the paragraph uses a cause-and effect structure?

"Globally, most countries have achieved a birth rate at replacement levels, about two children per woman."

"Babies often die before they turn five years old..."

"That's why empowering women is now one of the main solutions for feeding the world."

"Unless the status of women changes in sub-Saharan Africa, we're going to have a lot more than one billion hungry by midcentury."