The correct option is B Fused carpels
Syncarpous gynoecium has two or more fused carpels. Gynoecium is most commonly used as a collective term for the parts of a flower that produce ovules and ultimately develop into the fruit and seeds. The gynoecium is the innermost whorl of pistils in a flower and is typically surrounded by the pollen-producing reproductive organs. Flowers that bear a gynoecium but no androecium are called as carpellate. If a gynoecium has multiple carpels fused into a single structure, it is syncarpous. A syncarpous gynoecium can sometimes appear very much like a monocarpous gynoecium.
Therefore, the correct answer is option B.