Concept:The word "lax" means not strict, not severe, or not carefully enforced.
Explanation:The sentence says: "All the lax rules have been cancelled."
This means the rules that were not strict or not properly enforced are being removed.
"Lax" means lacking strictness, being loose, slack, or careless.
Now compare each given option.
"Mild" means not severe, serious, or harsh, which closely matches the sense of "not strict."
"Previous" means earlier or existing before, which is not related to "lax."
"Weak" means lacking strength, but rules are not described as physically weak.
"Wrong" means incorrect or mistaken, which is also unrelated to strictness.
Therefore, the nearest synonym of "lax" among the options is "mild."
Answer:Option A. mild