The O-O molecule is not polar since it is the only molecule in the list that has two atoms that do not have a difference in electronegativities.
I hope this helps. Let me know if anything is unclear.
"Water, as a vapor in our atmosphere, could potentially escape into space from Earth. ... While our planet as a whole may never run out of water, it's important to remember that clean freshwater is not always available where and when humans need it. In fact, half of the world's freshwater can be found in only six countries."-Will Earth run out of water? | AMNH (https://www.amnh.org/explore/ology/earth/ask-a-scientist-about-our-environment/will-earth-run-out-of-water)
The answer is C, have a good day!
Thomson's and Millikan's contributions to atomic theory:
Thomson is the first person, who suggest that the theory of the atom contains positive and negative particles and demonstrated the latter which are called "electrons".
Millikan: Millikan discovered that the weight of an electron is 1840 times smaller than a hydrogen atom that is having atomic mass 1.
This is called
Nuclear fusion
Example is two hydrogen atoms fuse to form a helium atom
Where some of the atoms of hydrogen turn in to energy
So the answer is A