There are four sentences given below labelled (1-4). From the options given, choose the option that states the grammatically correct sentence(s).
When a magnifying glass was used, the cell appeared green. (1)
Under a magnifying glass, the cell appeared green. (2)
When a large catch of fish was desired, a seine was hauled through the water. (3)
When a seine was hauled through the water, many fish were caught. (4)