Which phrase or sentence is the best TO CORRECT the underlined part :
The work of mathematician Roger Penrose in the early 1970s, on the geometry of what call aperiodic tiles, turned out to describe the architecture of a previously unknown class of crystals.
A.what are called aperiodic tiles, turned out to describe
B.what is called aperiodic tiles, describe
C.aperiodic tiles, describing
D.aperiodic tiles, it turned out to describe
The work of mathematician Roger Penrose in the early 1970s, on the geometry of what call aperiodic tiles, turned out to describe the architecture of a previously unknown class of crystals.
A.what are called aperiodic tiles, turned out to describe
B.what is called aperiodic tiles, describe
C.aperiodic tiles, describing
D.aperiodic tiles, it turned out to describe
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