Mary and Tim Have Been Married for 12 Years

Mary and Tim have been married for 12 years. Recently, Mary has acquired a new position as a teacher in a new school. Her aide is a man named Robert. Mary comes home and tells Tim how funny Robert is and how she and Robert eat lunch together and generally have a good time. The next day, Tim gives Mary a surprise: two tickets for them to go away for a romantic weekend to Colorado Springs. Tim's gesture of buying this surprise vacation for him and his wife is an example of

A) positive feedback.
B) negative feedback.
C) a corrective strategy.
D) an active perturbation.
E) a threat to equilibrium.