The two covalent bonds in a water molecule are polar because
a. oxygen is more electronegative than hydrogen.
b. oxygen and hydrogen have similar electronegativities.
c. oxygen is less electronegative than hydrogen.
d. water is a small molecule.
e. water is hydrophilic.

The correct option is the A

Explanation:

Like oxygen is more electronegative than hydrogen, it attracts electrons stronger than hydrogen. Therefore the two covalent bonds are polar.

The option b is incorrect because if oxygen and hydrogen had similar electronegativities, they would form no-polar bonds.

The option c is incorrect because oxygen is more electronegative than hydrogen (you can check that in a periodic table).

The options d and e are incorrect because the molecular size or hydrophilic don't influence the type bond.

i'm assuming that it's c.) red bank..

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.