Example 4 Let the areas of the four faces of a tetrahedron be $S_{1}, S_{2}, S_{3}, S_{4}$, and the largest among them be $S$. Let $\lambda=$ $\frac{S_{1}+S_{2}+S_{3}+S_{4}}{S}$, then $\lambda$ must satisfy ( ).
(A) $2<\lambda \leqslant 4$
(B) $3<\lambda<4$
(C) $2.5<\lambda \leqslant 3.5$
(D) $3.5 \leqslant \lambda<5.5$
(1992, National High School Mathematics Competition)
Analysis: If the tetrahedron is a regular tetrahedron, then $\lambda=4$, otherwise $\lambda=2$. Therefore, the correct choice is (A).