In a test in a middle school in a middle school, 75% of the students passed the English test, 80% of the candidates passed the math, 85% of the candidates passed the language, 90% of the candidates passed the physics, and 95% of the candidates Passed chemistry. If the above is true, then which of the following is correct? ['In this exam, most candidates passed five assignments.', 'In this exam, most candidates failed five assignments.', 'In this exam, no less than 15% of the candidates passed all five assignments.', 'In this exam, at least 15% of the candidates failed five assignments.']