This photomicrograph shows a rock with rounded particles of quartz (Q) and interstitial areas (surrounding the quartz) filled with silica (S) and calcite (C). Which of the following best explains the classification of this rock and how it formed? Choose one:
A. This is a clastic rock with silica and calcite cement that grew in pore spaces between grains.
B. This is a crystalline rock; all three materials crystallized in place at the same time.
C. This is a metamorphic rock with pronounced foliation.
D. This is a clastic rock; all three materials were deposited at the same time.