What risk exists if improvement is done without understanding the cause of a work mistake?

Correct answer: The mistake may repeat

The direct answer is A: the mistake may repeat. Improvement is useful only when we know what caused the problem. First, notice the mistake. Second, find its real cause, such as unclear instructions, lack of practice, or a faulty tool. Third, choose a correction that removes that cause. If we skip the second step and merely change the result, the same cause can produce the same mistake again. Option A is correct because repeated mistakes are a real risk. Option B is wrong because a problem does not always end merely because we try a correction. Option C is wrong because work does not improve automatically; people must understand and act. Option D is wrong because planning is still needed to prevent recurrence and check progress. Remember: find the cause before fixing the result.