Examine the Following Table of Characters in Four Different Species

Examine the following table of characters in four different species of flower. Based on the matrix, which character defines a synapomorphy shared by species A and B? $$\begin{array} { | l | c | c | c | c | } \hline & \text { Species A } & \text { Species B } & \text { Species C } & \text { Species D } \\\hline \begin{array} { l } \text { Presence of } \\\text { sepals }\end{array} & \text { yes } & \text { yes } & \text { yes } & \text { no } \\\hline \begin{array} { l } \text { Number of } \\\text { petals }\end{array} & \text { five } & \text { five } & \text { ten } & \text { ten } \\\hline \begin{array} { l } \text { Arrangement of } \\\text { petals }\end{array} & \text { whorled } & \text { whorled } & \text { whorled } & \text { whorled } \\\hline \begin{array} { l } \text { Number of } \\\text { carpels }\end{array} & \text { ten } & \text { ten } & \text { ten } & \text { five } \\\hline\end{array}$$

A) presence of sepals
B) number of petals
C) arrangement of petals
D) number of carpels