Investment model of close relationships, long-term relationships are most likely to continue when

At which level of production does the company make the most profit? the first pair of cleats the second pair of cleats the third pair of cleats the fourth pair of cleats

The social contact theory states that

Persons who have not yet attained the legal age of consent under the applicable laws in the jurisdiction in which the research was approved.persons who are under 18 years of age.persons who have not yet attained the legal age of consent under the applicable laws in the jurisdiction in which the research will be conducted.persons who are under 21 years of age.