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 parentage, socio-economic background and performance in learning of the concerned subject. (C) Learner’s stage of development, social background and personal interests. (D) Learner’s maturity level, academic perfor mance level and motivational dispositions.