Over time, housing shortages caused by rent control

A、a.
increase, because the demand for, and supply of, housing are less elastic in the long run.;

B、b.
increase, because the demand for, and supply of, housing are more elastic in the long run.;

C、c.
decrease, because the demand for, and supply of, housing are less elastic in the long run.;

D、d.
decrease, because the demand for, and supply of, housing are more elastic in the long run.