371 (bonus) Answer: (c) Paul is saying their "play" was immoral activity
Read 1 Corinthians 10:7 Read Ecclesiastes 8:15 Note: The GNT says, “The people sat down to a feast which turned into an orgy of drinking and sex” (1Cor 10:7). A few Bibles are direct, but most versions are more reserved than the GNT.
Note: In the People’s Bible Commentary: 1 Corinthians (91) Carleton A. Toppe tells his readers “‘Rose up to play’ are the familiar words of the KJV describing the idol celebration of the Israelites as they worshiped the golden calf. The ‘play’ included the lively dances that were the prelude to sex play.”
Note: We get some background information from Ernst H. Wendland in the People’s Bible Commentary: Exodus (201) where we are told that “Aaron’s choice of making a calf to serve as Israel’s idol was in keeping with Israel’s experience in Egypt. The Egyptian god Apis was a young bull, a symbol of power and sex. No doubt the Israelites had often seen the wild celebrations in Egypt connected with the so-called worship of this god.”