A portion of each of four destarched leaves of a plant was covered with paper strips of various kinds. The plant was exposed to sunlight for 5 hours. Thereafter, the strips were removed and the leaves tested for starch in the covered portion. Which one out of the four leaves gave the starch test in the covered portion?
(1) that covered with black paper strip
(2) that covered with green paper strip
(3) that covered with white paper strip
(4) that covered with transparent paper strip