Insufficient data to determine density numerically Steps:

• Mass of three bolts: 3 × 3.4 g = 10.2 g.
• Initial water volume: 30 cm³.
• The reading "rises 42 cm," but units are ambiguous (height in cm vs. volume in cm³); no cross-sectional area given to convert height rise to volume.
• Without volume of bolts, density = mass/volume cannot be calculated. Why D is correct:
• Not applicable; no option can be verified due to ambiguity. Why the others are wrong:
• A: Assumes final volume 42 cm³ (rise 12 cm³), yielding ~0.85 g/cm³, but "rises 42 cm" ≠ 12 cm³.
• B: No calculation matches 2.8 g/cm³.
• C: No calculation matches 7.5 g/cm³. Final answer: Not enough information.