Ans: B
Note that $T(1)=5$ and $T(n+1) = T(n) + 4$ for any positive integer $n$.
Note that $T(1)=5$ and $T(n+1) = T(n) + 4$ for any positive integer $n$.
$\begin{array}{rcl}
T(2) & = & T(1) + 4 \\
& = & 5 + 4 \\
& = & 9 \\
T(3) & = & T(2) + 4 \\
& = & 9 + 4 \\
& = & 13 \\
T(4) & = & T(3) + 4 \\
& = & 13 + 4 \\
& = & 17 \\
T(5) & = & T(4) + 4 \\
& = & 17 + 4 \\
& = & 21 \\
T(6) & = & T(5) + 4 \\
& = & 21 + 4 \\
& = & 25
\end{array}$
