Which technique requires the use of a burin, a specialized V-shaped piece of equipment? A. etching
B. lithography
C. engraving
D. silk screening
E. woodcuts

C- Engraving

Explanation: accomplished by pushing small v-shaped metal rod called a burin, across a metal plate, usually of copper or zinc, forcing the metal up and off the plate in slivers. Line engravings were commonly used to illustrate books and reproduce works of art in the era before photography.

pitch- the definition of pitch is as follows:

"the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone."