In terms of relationship commitment, things that people contribute in a relationship that they cannot get back if the relationship ends are called

A) gifts.
B) investments.
C) stocks.
D) exchanges.

Investments refer to things like time, effort, and emotional energy that one puts into a relationship, which cannot be returned in the event of a breakup. A and C are incorrect because gifts and stocks can both potentially be given back or regained after a relationship ends. D is incorrect because exchanges imply a transactional nature, whereas relationship commitment should not be approached as a transaction.