The moment of resultant of concurrent forces with respect to a center in their plane is equal to the algebraic sum of the moments of components with respect to same center. This theorem is known as

Correct option is A

​$$\begin{aligned}&\text{\textbf{Varignon's Theorem of Moments:}} \\&\text{"The moment of a resultant force about a point is equal to the sum of the moments} \\&\text{of its components about the same point."} \\[1em]&\textbf{Mathematically:} \\&\text{If a set of concurrent forces } \vec{F}_1, \vec{F}_2, \ldots, \vec{F}_n \text{ act on a body, and } \vec{R} \text{ is their resultant, then:} \\&M_O(\vec{R}) = \sum M_O(\vec{F}_i) \\[1em]&\text{Where:} \\&\quad M_O(\vec{R}) \text{ is the moment of the resultant about point } O \\&\quad M_O(\vec{F}_i) \text{ is the moment of each component force about point } O\end{aligned}$$​​