Use the Data Given Below to Answer the Following Question(s)

Use the data given below to answer the following question(s) .
The table below provides the sales data for JD Inc.for the year 1998.Given: α = 0.2, β = 0.15, and γ = 0.05 (Hint: Classify the data into quarters for the following question(s) .)
$\begin{array}{l}\text { Umbrella Sales of JD Inc. }\\\begin{array}{|c|c|c|}\hline \text { Year } & \text { Month } & \text { Units } \\\hline 1 & \text { Jan } & 3980 \\\hline 1 & \text { Feb } & 4000 \\\hline 1 & \text { Mar } & 4740 \\\hline 1 & \text { April } & 4720 \\\hline 1 & \text { May } & 4920 \\\hline 1 & \text { Jun } & 5140 \\\hline 1 & \text { July } & 4640 \\\hline 1 & \text { Aug } & 4520 \\\hline 1 & \text { Sep } & 4480 \\\hline 1 & \text { Oct } & 4690 \\\hline 1 & \text { Nov } & 4210 \\\hline 1 & \text { Dec } & 4418 \\\hline\end{array}\end{array}$
-What is the value of the mean absolute deviation for the given data?

A) 8.10
B) 346.26
C) 14.82
D) 7.62