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Case-Based-II: The given diagram represents a part of the periodic table which contains first three periods in which 5 elements have been denoted by the letters A, B, C, D and \( \mathrm{E} \) (which are not their chemical symbols):
\begin{tabular}{|c|c|c|c|c|c|c|c|c|}
\hline 1 & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{18} \\
\hline \( \mathrm{A} \) & 2 & 13 & 14 & 15 & 16 & 17 & \\
\hline & & \( \mathrm{B} \) & & & & & \( \mathrm{C} \) \\
\hline \( \mathrm{D} \) & & & & & & \( \mathrm{E} \) & \\
\hline
\end{tabular}
Halogen is represented by which of the following letter ?
a. (B)
b. (A)
c. (D)
d. (E)
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