Is the abdomen of a carpenter bee hairy all over?

The abdomen of a carpenter bee is not hairy all over; it is actually fairly smooth and shiny. This characteristic difference is particularly notable in the female carpenter bees, which have a more hair-covered body that is designed for pollen collection, while the males tend to have less hair and a more shiny abdomen. This distinction helps in identifying the genders of carpenter bees. Since the question specifically asks about the hairiness of the abdomen in general, stating that it is not hairy all over is accurate, making the option that indicates this fact the correct choice.