What does this phrase mean"to spoil by introducing foreign matter"​

Answer the question find a book and find the answer to this question

Bella is going to write a research paper. she chose sports as her topic, but her teacher said she must narrow or limit her topic. choose the topic that limits the broad topic of sports the most. a) a history of sports in the united states b) a history of tennis c) rules and etiquette of tennis d) training and equipment for outdoor sports

Jeff's response to justin assumes that justin is following which maxim? justin: hey, jeff! jeff: yeah? justin: get ready for the news of the day! jeff: okay. justin: i got that job i was after! jeff: wow! that's great! justin: ! starts right now! later!