Consider the following phenomena: (i) Forest fire (ii) Growth of plants (iii) Low and high tides (iv) Occurrence of a rainbow (v) Earthquakes (vi) Opening of a morning glory flower. Which of the above phenomena can be classified as periodic changes?

• A. (i), (ii) and (iii)
• B. (i), (ii) and (v)
• C. (iv), (v) and (vi)
• D. (iii) and (vi)