Parents nowadays try to provide their children with ________ best possible education, preparing them for ________ society of fierce competition．
A.the; /B./; theC.the; aD.the; the在线课程C
解析：
考查冠词用法。根据句中的best可知要与定冠词the连用；
后一个空格处指的是一个充满激烈竞争的社会。难度适中。