Historian Stephanie Coontz points out that by 1978, percent of the population thought that it was morally okay to be single and have children.

75

Explanation:

Stephanie Coontz a professor of history at The Evergreen State College in Olympia, Washington and the chief of Public Education and Research at the Council on Contemporary Families. She is generally a recognized figure and one of the leading personalities on the history of the American family.

According to her book titled "Marriage, A History," she revealed that by 1978 75% of the population will believe that it was morally fine to be single and have children.

the answer is a quran