Simple predicate is just a complicated way of saying "verb", so the verb in this sentence is "were", or in the infinitive, "to be"
D because she is a PE teacher.
B is the answer because I don’t know if the cordinents is correct or if they are not right up
The highlighted phrase says "through their own spectacles", which means that the answer must be the third option as it is the only one including the whale's point of view.
I hope this helps!