Which of the following learner characteristics are likely to influence the effectiveness of teaching aids and evaluation systems to ensure positive results?

• A. Learner's family background, age and habitation.
• B. Learner's stage of development, social background and personal interests.
• C. Learner's maturity level, academic performance level and motivational dispositions.
• D. Learner's parentage, socio-economic background and performance in learning of the concerned subject.