The answer is B. If it were to cause anything, then it’d be the others, but it just prevents fuel from igniting at the wrong time.
For number 5, is D. For number 6, is C. For number 7, is B.
Citizens of Sparta and Athens would most likely be people living in a "City State" according to recent studies of the Greek mythology
Enclosures pushed peasants out of the countryside and for those who stayed ..poverty..Many remained as tenant farmers,small landowners or wage earners. Fifty percent of England’s farmland was already enclosed by 1750.
