Concept:The word “ignorance” means a lack of knowledge or awareness.
Explanation:The sentence says children behave badly out of ignorance.
This suggests their bad behaviour is caused by not knowing better or by limited life experience.
Option A, “illiteracy”, only means being unable to read or write, which is too narrow.
Option C, “unfamiliarity”, means not knowing something specific, but it is weaker than the general lack of knowledge shown here.
Option D, “simplicity”, refers to being simple or plain, not to lacking knowledge.
Option B, “inexperience”, best matches the idea of lacking knowledge that comes from having little experience.
Therefore, the nearest in meaning is “inexperience”.
Answer:B. inexperience