Tuesday's Psychological Trivia: Sex, Lies, Love & Psychology

Thought for the Day: Today's trivia question relates to the psychology of love. Since last Saturday's Songs for the Soul were related to spring & included songs about love, joy, change & hope, I decided to follow part of the spring topics today with a question about love. Here goes. What do you think the answer  is?
           Psychologists believe that love is:
               a) a biological phenomenon
               b) a learned behavior
               c) a motivational drive
               d) a social phenomenon
               e) a basic emotion
               f) a) & d)
               g) b) & d)
Come back on Thursday for the answer. Have a great week, hope the weather is springlike where you are!