In a polar covalent bond, electrons are not between ?

In a polar covalent bond, the bonding pair of electrons in the bond are attracted more strongly to one molecule than the other. This means the electrons are pulled closer to one atom than the other.
In the example of water, the electrons, in the hydrogen-oxygen bond, are more attracted to oxygen and therefore the electrons are drawn closer to the oxygen. This leads to a slightly negative charge on the oxygen and a slightly positive charge on the hydrogen.

 

Correct A). It is an answer to a scientific question and is based mostly on research

The theory of heredity was given by the Mendel, which explained the process of inheritance of the traits. He explained that there are two alleles for a single gene, each one of them is obtained from father and mother.

This theory of Mendel  was developed after several years of research and experiment, which answer that how the traits are passed from parents to offspring.

Hence, the correct answer would be ''it is an answer to a scientific question and is based mostly on research''.