Market Efficiency Question L1
Practice quiz question paraphrase: "if market prices reflect all public information, at a minimum, the market is:"
a) Weak-form efficient
b) Semi-strong form efficient
c) Strong-form efficient
The question says "at a minimum", yet the correct answer is semi-strong form efficient. Since semi-strong efficient encompasses weak-form, why is the answer not weak-form, since at a minimum the market must be weak-form efficient to be semi-strong form efficient? We are taught to answer the question according to the phrasing provided, yet this question seems to use "at a minimum" incorrectly.
Can someone provide their input? 80% of the people who answered got it correct, so I feel like I'm David fighting Goliath here. Thank you.