A. Expansion of joints
B. Contraction of joints
D. Tightening of joints
This question was posed to me during an interview for a job.
The origin of the question is Composite Masonry in section Composite Masonry of Construction & Building Materials
For explanation I would say: In reinforced brickwork, it is important to keep in mind that it should be embedded with dense cement mortar in order to prevent corrosion. Corrosion of the reinforcement results in cracking as well as the expansion of joints.