Discussion
The number of crystal systems and the number of Bravais lattices are, respectively,
Answer: D
There are 7 crystal systems and 14 Bravais lattices.
The seven crystal systems are cubic, tetragonal, orthorhombic, hexagonal, trigonal (rhombohedral), monoclinic and triclinic. Combining them with the possible centrings (primitive, body-centred, face-centred and base-centred) gives the 14 distinct Bravais lattices.
32 is the number of crystallographic point groups (crystal classes), which is the trap in the options pairing 32 with 7 or 14. '14 and 7' simply reverses the two numbers.
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