What is the most logical next event?

How to lessen aggressive behavior in poison dart frogs
Note the signs of aggression.
If you have more than one frog in the terrarium, watch carefully for signs of aggression. These can include chasing one another and wrestling.

Select from:
A). Most aggressive frogs will come running every time they see a sign of aggression or nothing at all. The first sign of aggression could be movement from another frog..
B). Sometimes one frog will sit on top of another, preventing the one underneath from moving. It might look funny to you as an observer but it is highly distressing to both the attacking frog and the attacked frog to be worked up into such a state..
C). Aggression is much less immediate than aggression, so it can be hard to tell if a frog is fearful or not. Recognize that you should use caution when handling multiple frogs..
D). These early indicators can give you a clue as to which frogs may be attacking you. These signs will help you know when to get to your frog..
B).