If the prefix ''con-'' in the sentence given above means “with” or “together,” the term contend means to stretch together or to compete. Therefore, the option D holds true.
A prefix can be referred to or considered as a tool of the English language that is used to add a set of specific letters before a word in such a way that it leads to a complete change in the meaning of the actual word.
Using the prefix ''con'' in the word contend, as given in the sentence above, completely changes the meaning of the word 'tend'. Moreover, it also leads to a change of the structure of the sentence, and use of the word in the sentence without prefix will be meaningless.
Therefore, the option D holds true and states regarding the significance of a prefix.
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