since the a and c choice are the same we can say either of them.
As for B, we need to start with capital letter <em>This</em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em> and we also need to put full stop at the end of the sentence <em>.</em><em>.</em><em>.</em><em>.</em><em>.</em><em>it.</em>
And for D, we haven't opened quotation mark from the start It should be <em>"</em><em>This</em><em>.</em><em>.</em><em>.</em><em> </em>and we need to end the quotation that we have opened at <em>"</em><em>for</em><em>.</em><em>.</em><em>.</em><em> </em>with<em> </em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em><em>it"</em>