Which of the following is true of reference groups?

A) Reference groups are not "groups" in the sense that they involve interaction.
B) A well-adjusted person has only one reference group at a time.
C) The influence of a given reference group can be positive or negative but not both.
D) Reference groups influence our behavior only during childhood.

Reference groups are not necessarily "groups" that involve interaction, but rather they are groups that individuals use as a standard for evaluating themselves and their behavior. Therefore, option A is the correct answer as it accurately defines reference groups. Option B is incorrect as individuals can have multiple reference groups at a time, and option C is incorrect as the influence of a reference group can be both positive and negative. Option D is incorrect as reference groups can continue to influence our behavior throughout our lives.