As used in the text (Para. 6) the word "petty" most probably means

A．home training is more important than school training in that a child spends se many hours with parents
B．teachers can and should help parents to understand the objectives of the school
C．parents need to realize how to cooperate with the teachers in educating their children
D．parents have unconsciously hindered and obstructed curricular objectives

A．participation in interesting activities relating to a subject improves one's achievement in that area
B．too many children are lazy and have poor study habits
C．school principals should do more than their share in interpreting the curriculum to the parents
D．teachers should occasionally make home visits to parents