"Though it is not unusual to hear stories about immigrants who were detained on Ellis Island, records show that the majority of immigrants who arrived in the United States were permitted entry in an expedient manner. Most arriving immigrants were there for only a short three to five hours. First, they had to submit to a quick medical exam. The doctors at Ellis Island were skilled at conducting 'six-second physicals' during which they could diagnose various conditions with just a glance. After passing the medical exam, immigrants were subjected to a legal exam to ensure that they would be able to support themselves in the United States. Although most immigrants passed these two tests, some did not." Which of these sentences from the excerpt is a not a minor supporting detail?

"Although most immigrants passed these two tests, some did not."

"The doctors at Ellis Island were skilled at conducting 'six-second physicals' during which they could diagnose various conditions with just a glance."

"First, they had to submit to a quick medical exam."

"Though it is not unusual to hear stories about immigrants who were detained on Ellis Island, records show that the majority of immigrants who arrived in the United States were permitted entry in an expedient manner."