Concept:
Pablo Picasso (1881--1973), one of the founders of Cubism, experimented with a wide variety of artistic media, including painting, printmaking, ceramics, and sculpture.
His work Head of a Woman is one of his important sculptural creations made using the technique of welded metal sculpture. Picasso assembled and welded pieces of sheet metal to create expressive three-dimensional forms, making significant contributions to modern sculpture.
Step 1: Recall the medium of Picasso's Head of a Woman.
The artwork was created as a
\[
\boxed{\text{Welded Sculpture}}
\]
using welded metal components.
Step 2: Examine the given options.
• Acrylic on Canvas -- Incorrect; acrylic became common much later and is not the medium of this work.
• Oil on Canvas -- Picasso painted many works in oil, but Head of a Woman referred to here is a sculpture.
• Welded Sculpture -- Correct; the artwork is executed as a welded metal sculpture.
• Wood cut -- A printmaking technique, not the medium of this artwork.
Hence,
\[
\boxed{\text{(C) Welded Sculpture}}
\]