Match the following columns.

Column $I$	Column $II$
$(A)$ Constant positive acceleration	$(p)$ Speed may increase
$(B)$ Constant negative acceleration	$(q)$ Speed may decrease
$(C)$ Constant displacement	$(r)$ Speed is zero
$(D)$ Constant slope of $a-t$ graph	$(s)$ Speed must increase

• A
  $(A \rightarrow p, q, B \rightarrow p, q, C \rightarrow r, D \rightarrow p, q)$
• B
  $(A \rightarrow q, B \rightarrow p, C \rightarrow r, D \rightarrow p, q)$
• C
  $(A \rightarrow p, r, B \rightarrow p, s, C \rightarrow r, D \rightarrow p, q)$
• D
  $(A \rightarrow p, q, B \rightarrow p, q, C \rightarrow r, D \rightarrow p, q)$