Column I gives some devices and Column II gives some processes on which the functioning of these devices depend. Match the devices in Column I with the processes in Column II and indicate your answer by darkening appropriate bubbles in the $4 \times 4$ matrix given in the ORS.

• Correct answer
  A

  A-s; B-q; C-p, q; D-q
• B

  A-p; B-r; C-r, s; D-p
• C

  A-s; B-p; C-p; D-q
• D

  A-p; B-r; C-p, q; D-p

Hence, the correct answer is option: 'A'.