The answer is the last one !
In a water molecule<span>, the </span>oxygen<span> atom and </span>hydrogen<span> atoms share electrons in covalent bonds, but the sharing isn't equal. ... The unequal sharing of electrons gives the </span>water molecule<span> a little bit of a negative charge near its </span>oxygen<span> atom and a slight positive charge near its </span>hydrogen<span> atoms.</span>
No answer is possible.
Without the picture ... or a detailed explanation ...
it's not possible to tell what 'b' is.
Not sure right now give me a few mins
