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Case-Based-III: The following table shows the position of six elements \( \mathrm{a}, \mathrm{b}, \mathrm{c}, \mathrm{d} \), e and \( \mathrm{f} \) in the periodic table.
\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|}
\hline \( \begin{array}{c}\text { Group } \\
\text { Periods } \\
\downarrow\end{array} \) & 1 & 2 & 3 & 13 & 14 & 15 & 16 & 17 & 18 \\
\hline 2 & a & & & & & \( \mathrm{b} \) & & & \( \mathrm{c} \) \\
\hline 3 & & \( \mathrm{~d} \) & & & \( \mathrm{e} \) & & & & \( \mathrm{f} \) \\
\hline
\end{tabular}
- Using the above table answer the following questions:
Select the element which is a non-metal with valency of 3 .
a. a
b. b
c. e
d. d
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