Forensic Specialists Compiled the Following Information for Its First Quarter

Forensic Specialists compiled the following information for its first quarter cost of quality report:
$$\begin{array} { l r r } \text { Sales } & \$ 5,600,000 \\\text { Cost of goods sold } & \$ 3,360,000 \\\text { Disposing of scrap } & \$ 235,200 \\\text { Quality training } & \$84,000 \\\text { Inspecting materials on delivery } & \$ 280,000 \\\text { Performance reviews } & \$ 70,000 \\\text { Resolving customer complaints } & \$ 31,920 \\\text { Certifying suppliers } & \$ 140,000\end{array}$$
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The relevant percentage to be used to express internal failure activities at Forensic Specialists is:

A) 27.9%.
B) 4.77%.
C) 4.2%.
D) 15.02%.