The author is of the opinion that Coleman's beliefs are________.

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

A．having the parent observe lessons which the children are being taught
B．principal-parent conferences rather than teacher-parent conferences
C．written communications to the parent from the teacher
D．a father's helping his son with the latter's studies