Hello Lilsavage717, I believe the answer you are looking for is C. or Amino Acids. They are mainly located in living things like plants or bugs.
Acids and bases are fairly important for the fact that they are very essential to the human body. As well as they balance the Ph levels in our body. You can use acids and bases to nurtralize eachother aswell
To answer this problem, we need to count the electrons in the given configuration. The complete configuration is 1s2 2s2 2p6 3s2 3p6. There are 2+2+6+2+6 equal to 18 electrons. We find next the element with an atomic number of 18. That element is noble gas argon.
Pure substance element I think