Proton-proton chain reaction is: the destruction of energy due to lost atoms. the creation of energy through the process of nuclear fusion. the sharing of energy through radioactive zone. the decline of energy due to a solar eclipse.

The creation of energy through the process of nuclear fusion.

Explanation:

A hydrogen atom is called a proton since it has one proton and zero neutrons, in its nucleus. Nuclear fusion is a process in which lighter nuclei  will combine to form a heavier nucleus . Proton - proton chain reaction occurs in stars. Sun is one of the stars in which the energy release is due to the proton - proton chain reaction.  It generates nuclear energy . The combination of one hydrogen with another results in the formation of helium atom and the fusion energy after a series of reactions.

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.