The correct option is
B Gynoecium comprises more than one carpel, all of which are free
The gynoecium is the female reproductive whorl whose individual unit is called carpel. When the carpels are more than one it is called multicarpellary. When these carpels are free from each other and do not show cohesion, the condition is called apocarpous.
A. The gynoecium is gynandrous when fused with stamens.
B. The gynoecium is apocarpous when more than one carpel are there and they are free.
C. The gynoecium is multicarpellary syncarpous when more than one carpels are fused with each other.
D. The gynoecium s simply monocarpellary when there is only one carpel.
Hence, the correct answer is 'Gynoecium comprises more than one carpel, all of which are free'.