Use the Table and the Given X-Ray Absorption Diagrams to Identify

Use the table and the given X-ray absorption diagrams to identify the composition of each of the regions marked by a letter. The number in each region shows its absorption, and the number on each X-ray beam shows the total absorption for that beam. $$\begin{array} { | l | l | l | l | l | l | l | } \hline \text { Type } & \text { Air } & \text { Water } & \text { Gray matter } & \text { Tumor } & \text { Blood } & \text { Bone } \\\hline \text { Absorption } & 0 & 1,000 & 1,020 & 1,030 & 1,050 & 2,000 \\\hline\end{array}$$ $a = 4050$ , $b = 5130$ , $c = 8000$ , $d = 3020$

A) $\begin{array} { l } x = \text { Blood } \\y = \text { Bone } \\z = \text { Gray matter } \\u = \text { Water }\end{array}$

B) $\begin{array} { l } x = \text { Bone } \\y = \text { Tumor } \\z = \text { Water } \\u = \text { Gray matter }\end{array}$

C) $\begin{array} { l } x = \text { Tumor } \\y = \text { Bone } \\z = \text { Water } \\u = \text { Gray matter }\end{array}$

D) $\begin{array} { l } x = \text { Tumor } \\y = \text { Water } \\z = \text { Bone } \\u = \text { Gray matter }\end{array}$

E) $\begin{array} { l } x = \text { Blood } \\y = \text { Bone } \\z = \text { Water } \\u = \text { Gray matter }\end{array}$