The correct answer is It would be more difficult for DNA to unzip since it would require more energy to break the bonds.
That is because it would most probably be a covalent bond and such a bond is stronger than a hydrogen bond which means that more energy would be needed to break it.
A. Climate, because the climate is the weather conditions in an area for a long period of time, so she would be able to pack clothing that wouldnt hinder her in that specific climate