What is the best reason for a student to remove a dangling bracelet when heating test tubes of acidic solutions in a hot- water bath in a chemistry lab?
to avoid reactions of the metal with gases in the lab
to reduce the risk of burns from heat conducted through the metal
to minimize the chance the bracelet pulling over a test tube, causing a spill
to prevent misreading the temperature of the bath on a thermometer

I would say to Minimize the chance of the bracelet pulling over a test tube, causing a spill.

Explanation:

No one wants to get third degree burns, do they? Responsible teachers are always looking for the safety of their students, so they ask that they remove jewelry, and roll up their sleeves if using Bunsen Burners, or using Water-Baths.  

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.