What is the total amount of direct materials used in production for Royal Technology Company in March, given the following information:

a. Materials purchased on account: $770,000.
b. Materials requisitioned for production: $720,000.
c. Indirect materials included in manufacturing overhead: $50,000.

A) $770,000
B) $720,000
C) $670,000
D) $770,000 (materials purchased) - $50,000 (indirect materials)