According to Bohr's planetary model of the atom, why don't the electrons collapse into the nucleus of the atom? The neutrons repel the electrons, keeping them in their energy levels.

The electrons are moving so fast that the pull from the nucleus is not enough to attract them.

The positively charged protons repel the negatively charged electrons, keeping them in their energy levels.

The electrons spin onto the nucleus, but they bounce back out into energy levels.

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explanation:

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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.