A student was asked to determine the activity of four unknown metals, W, X,Y, and Z. They are given the metals and four nitrate solutions of the unknown metals. The nitrate are shown across the top of the chart. They placed each metal in each compound except where there is a dashed line--, as shown in the chart

The answer is c - the principal of original lateral continuity. 

Answer    "a salt" would be the best answerexplanationsalts can be defined as ionic compounds that are neither acids nor bases. nacl is an example of a salt, and its ionic.an enzyme is an organic compound which is covalently bonded, not ionically bonded.acids are generally held together by covalent bondsan element does not need any bonds to exist

B. nuclear reactions could first occur.