I would go with choice A) because today u don't just touch acid when u feel like it because the chemicals can burn your skin off to the bone itself and even animals.
Salutations!
<span>Cells that perform similar functions combine to form: ----
</span><span>Cells that perform similar functions combine to form: tissues. A group of tissues working together combine to form an organ system. Organs working together combine to form an organ system. Organ system performing their functions makes an organism.
Thus, your answer is option D.
Hope I helped (:
Have a great day!</span>
