Answer:
Andrew did not gift the pen to Carla. He only lent it out to her.
Step-by-step explanation:
Sometimes in order to acquire things we do things that are silly and somewhat funny. This is the same case with Carla in the question above. Carla loves unique pen and seeing one with Andrew she thought of a way for the pen to be hers and devised that way.
That was not right for her to do. She could have asked Andrew to gift the pen to her or ask her parents or caretaker to get something of such for her.
Andrew has all the right to collect back his pen, because he never did give Carla the pen as a gift in the first place.