According to ASTME 709-95 and API, in order to eliminate all contaminants, an appropriate cleaning shall be performed on all the surfaces to be examined and on a minimum of adjacent material:

According to ASTME 709-95 and API, in order to eliminate all contamina

1.	According to ASTME 709-95 and API, in order to eliminate all contaminants, an appropriate cleaning shall be performed on all the surfaces to be examined and on a minimum of adjacent material:
A.	25.4 mm (1 inch)
B.	31.7 mm (5/4 inches)
C.	38.1 mm (1.5 inches)
D.	44.5 mm (7/4 inches)
Answer» B. 31.7 mm (5/4 inches)