введите описание изображения здесь Как я могу добавить дополнительную строку ниже B и при этом держать A вертикально по центру?Спасибо!
\begin{table}[!t]
\centering
\caption{Relation of the objectives of this thesis (1, 2, 3 and 4) with the known facts and open questions described in Sections \ref{sec:in-situ}-\ref{sec:veils}.}
\label{table:objectives}
\begin{tabularx}{\textwidth}{@{}XXc@{}}
\toprule
\multicolumn{1}{c}{Known facts} & \multicolumn{1}{c}{Open questions} & Objectives \\ \midrule
The resistance to matrix cracking depends on ply-thickness (also known as in-situ effect) & There is no evidence of the in-situ effect under out-of-plane shear & \multirow{10}{*}{1} \\
& There is controversy about which damage mechanism triggers the other & \\
Impact failure involves shear cracks and delaminations & There is controversy about which damage mechanism penalizes the load-carrying capacity & \\
& There is no clear evidence of how ply-thickness affects the damage sequence & \\ \midrule
Thin-plies increase certain in-plane mechanical properties because of the in-situ effect & \multirow{4}{=}{There is little information on how ply-thickness affects thin laminates' impact response} & \multirow{4}{*}{2} \\
Thin-plies display brittle failure mechanisms & & \\ \midrule
A & Few studies connect the microstructure and the properties of interleaved systems & \multirow{5}{*}{3$\&$4} \\
A & B & \\ \bottomrule
\end{tabularx}%
\ end {table}