Groups that deteriorate over time move into a stage known as

a. deteriorating

b. adjourning

c. declining

d. maturing e. disbanding

The answer is (c.) Declining

In this scenario, the group that deteriorates over time move into a stage known as declining. In dictionaries, declining means something that goes smaller, fewer or decrease. In product cycle, declining is the stage in where the sales drop and production is halted.