$$
\begin{array}{l}
\text { 25. If } T_{\mathrm{n}}=1+2+3+\cdots+n, \\
P_{\mathrm{u}}=\frac{T_{2}}{T_{2}-1} \cdot T_{3}-1 \cdot \frac{T_{4}}{T_{4}-1} \cdots \\
\cdot \frac{T_{\mathrm{n}}}{T_{\mathrm{n}}-1}, n=2,3,4, \cdots,
\end{array}
$$

Then $P_{1091}$ is closest to which of the following numbers?
(A) 2.0 .
(B) 2.3 .
(C) 2.6 .
(D) 2.9 . (E) 3.2 .
$\mathrm{D}$