A should be the answer because the more you test an experiment the more data you have to rely on changing the experiment would cause you to have different outcomes making the results different and unreliable so B, C, and D is not going to be the answer Hope this helps
Answer:
the answer is B-2nd; stars
Explanation:
Co2 = two covalent bonds
ccl4 = 4 covalent bonds
Lih = covalent bond
