According to Maulana Maududi the concept of knowledge was___________________?

A. Knowledge is Allah’s greatest gift to mankind
B. Quran and Hadith the fountainhead of the knowledge
C. Islam firstly consists of knowledge and secondly of putting that knowledge into practice
D. All of these

The correct answer to the question: "According to Maulana Maududi the concept of knowledge was___________________?" is "All of these".