The A antibodies will produce A antibodies and B antibodies will produce B antibodies
This picture represents humoral immunity, please read through it, and if you dont understand which option is your answer then i would recommend you read more about this topic, if you want it to be done fast, you can read this http://www.s-cool.co.uk/a-level/biology/immunity/revise-it/the-third-line-of-defence
I hope you can come up with the answer on your own as it will be a good thing for you in your future exams :)
Surely i can help you if you dont understand something so just ask :D
The answer is D. lose apical dominance and grow lateral branches
Apical meristem is a meristem tissue found at the branch tips. When it is active, tree grows in height and the lateral branches will not be as dominant. Imagine conifers and their branches. However, when apical meristem is removed, that apical dominance will be lost, and the lateral branches will become more dominant, so the tree will look more branchy.