Cloze Passage:
When it became difficult to empirically prove that children learn better in private schools, the attack invented a new weapon: per unit cost of learning outcomes. Most of the learning outcome researches almost always fail to understand the entire ______ of education in any depth and reduces it to learning of so-called 3Rs for economic purposes.

Select the correct option for the fifth blank.

1. A
   purpose
2. B
   target
3. C
   scheme
4. D
   ambition