Theanswer should be (1). Lets do an imaginary experiment: a) Takeout the marble from the cup but don’t put into the water. What will happen? b) The marking on the cup will float above thewater level because it is lighter now. Notethat the original marking on the cup is the same as the water level. So answers (2) and (4) are wrong as the marking on the cup is the same as the water level. c) What will happen to the water level? If the marble is not in the water, there isless displacement (ie lighter weight of the cup)) and thus, the water levelmust now be lower than the marking on the basin. d) Now lets put the marble is put into thewater. The water level must rise becauseof the addition of the marble. However,it cannot rise above the marking in the basin because the marking on the basinis the sum of the water displacement caused by the cup and marble. e) If the water level rises above the marking inthe basin, it means that somehow, the weight of the cup and the marble hasincreased and thus, causes more displacement of the water. This cannot happen.
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