help?LSAT Section1-I-10

merlion

原题是 more stringent rules ->airplane mechanical problems have increased 50%
此处是排除他因。原题说RULES引起 increased 50%，假设Mechanical problems自己没increased 50%。 C如取非，原题不成立。E取非， 不反原题。这个E不是可能性假设。