Discussion
The essential symmetry(ies) for a monoclinic crystal system is/are the presence of
Answer: B
The essential symmetry is one \(C_2\) axis.
Each crystal system is defined by its minimum symmetry. A monoclinic crystal needs a single twofold axis (or, equivalently for the lattice, a single mirror plane perpendicular to it), which is why one of its three cell angles differs from 90 degrees.
One \(C_3\) axis is the essential symmetry of the trigonal (rhombohedral) system, one \(C_4\) axis of the tetragonal system, and one \(C_6\) axis of the hexagonal system. So of the four, only the \(C_2\) axis applies; this multiple-select question has that single correct choice.
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