In a voltaic cell, the
electrons and is oxidized, while
electrons and is reduced.

In a voltaic cell, anodic electrons gets oxidized and cathodic electrons gets reduced.

Explanation:

A voltaic cell is defined as an electrochemical cell which converts a chemical reaction leads to the production of electrical energy.

In these cells, oxidation reaction occurs at anode electrode and reduction reaction occurs at cathode electrode.

Oxidation reaction is defined as the reaction in which an atom looses its electrons. The atom gets oxidized during this reaction.

Reduction reaction is defined as the reaction in which an atom gains electrons. The atom gets reduced during this reaction.

Hence, in a voltaic cell, anodic electrons gets oxidized and cathodic electrons gets reduced.

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.