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3 is the answer 

Beaker A, with Rose syrup has the least space for water to occupy. So, it will overflow within a  short time. 

Beaker B, with stones is not so tightly packed and has more space than the beaker C (sand) and will take more time to fill. 

Beaker C with sand is tightly packed and will take more time than  Beaker A, Rose syrup. 

Beaker D, has the most space to fill water and will take more time to overflow.

 

 

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I will choose (4). Stones and sand are not resolved in water, hence they will occupy more volumes in the beakers. It appears that sand has less space inside. Hence the beaker containing the sand will be the first one to overflow.

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