Clear organisation helps a teacher present subject matter so students can follow and understand it.
Why D is marked: A logical sequence connects new ideas with prior knowledge and makes the main points easier to recognise.
Why B and C are weaker: Delivering information alone does not ensure understanding; focusing only on examinations is too narrow.
Question-quality note: Helping students become better citizens is also a valid educational aim. The question would be clearer if it specifically asked about effective presentation of a lesson.