Choice A is the correct answer.
The 's' and apostrophe after the word singer lets the reader know that something is belonging to the group of singers. The apostrophe will always go after the 's' if we are talking about a group of individuals.
When the choral group began, the singers' voices carried throughout the auditorium.
They demonstrated their values by enduring all the hardships and holding together, in spite of bad conditions. The disease and hunger struck them even the first winter. Many people died from starvation or illness, and the only seven people who didn't get sick took over all the work that needed to be done. They never complained, but praised God and patiently waited for the temptations to end, while diligently working all the time.
The answer is D, a connotation.
For one thing there was a great influx of legal immigration. People came from many parts of Europe. They had to be taught English which was the language of the time.
For another, America was becoming more industrialized which meant she needed trained workers. This is true of many other countries as well.
