Depth of thread is ______ times of pitch in case of British Standard Whitworth Thread.

Depth of thread is ______ times of pitch in case of British Standard W

1.	Depth of thread is ______ times of pitch in case of British Standard Whitworth Thread.
A.	0.75
B.	0.64
C.	0.55
D.	0.80
Answer» C. 0.55