1 football = 1 football
Asking someone to give an approximate measurement of the length of a football is pretty odd. A football is one football long, just as a football field is one football field long. We don’t use feet, inches, or yards to measure footballs, people. And don’t even start with us by saying football should be called hand egg (even though it should).
Kid, that’s not how multiple-choice questions work. You can’t just add words to one of the provided answers to fit your answer. That’d be like manipulating the stock market and making millions off of the misery of companies and their employees. It’s unethical.