16) D

This is rather a simple question.

Before filling 500 l of oil, the height of the dipstick was 0.15 m. According to the graph, 0.15 m is 400 l of oil.
After filling the 500 l of oil, the tank would contain = 400 + 500 = 900 l

900 l, according to the graphs is 0.6 m.

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