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The correct answer to the question is:
B) "Half a league, half a league,"
This line is written in iambic pentameter. Iambic pentameter is a poetic meter that consists of five feet per line, with each foot having one unstressed syllable followed by one stressed syllable. In this line, each foot follows the pattern of an unstressed syllable followed by a stressed syllable, making it an example of iambic pentameter.
I hope this explanation helps you understand why option B is the correct choice for being written in iambic pentameter. If you have any more questions or need further clarification, feel free to ask!