The first choice has the most reasonable and backed up claim.
I'm pretty sure that the correct answer is d. meaningful and enjoyable interactions that are important.
There are many factors involved in the improvement in the life expectancy such as sanitation, housing, scientific research to cure many diseases and infections, education etc.
Historically it was the nineteenth and early twentieth century when all these improvements were made due to which the mortality rate decreased intensively in early and middle ages.
A subatomic particle with a positive charge is a proton
D. She feared that the cancer and the treatments would leave her infertile.
