Read the following passage:
FERDINAND
O heaven, 0 earth, bear witness to this sound
And crown what I profess with kind event
If I speak true! if hollowly, invert
What best is boded me to mischief!
Beyond all limit of what else i' the world
Do love, prize, honour you.
What is the meaning of profess, as used in this passage?
A. Declare
B. Shout
C. Teach
D. Write