Final answer:
The correct answer to the question is 'a) Fall', as it matches the context of taking 'a terrible tumble', indicating an unintentional drop or stumble.
Step-by-step explanation:
The answer to the schoolwork question is 'a) Fall'. The provided excerpts contain various instances of people or objects in motion, such as falling, leaping, diving, and splashing. However, in the context given - 'There, there now. You took a terrible tumble, dear boy' - the word that best fits the scenario is 'fall', as it implies an unintentional drop or stumble, which is consistent with the connotation of taking 'a terrible tumble'.