In which system are all the three axes and three angles of unequal length and none of the angles is 90?

Explanation

Option A: In the cubic crystal system, all three axes (a, b, c) have equal lengths, and all angles (α, β, γ) are 90 degrees. This system exhibits a high degree of symmetry and is characterized by its cubic shape. Option B: In the triclinic crystal system, all three axes (a, b, c) have unequal lengths, and none of the angles (α, β, γ) are equal to 90 degrees. The angles can take on any value between 0 and 180 degrees. This system has the least symmetry among all the crystal systems. Option C: In the tetragonal crystal system, two of the axes (a, b) have equal lengths, while the third axis is of a different length. All the angles (α, β, γ) are 90 degrees. This system exhibits a four-fold rotational symmetry around the c-axis. Option D: In the monoclinic crystal system, all three axes have unequal lengths, and only one angle (β) is 90 degrees, while the other two angles (α, γ) are not equal to 90 degrees. This system exhibits a single mirror plane and lacks rotational symmetry.