Gynoecium having three fused carpels with three locules is ______________.
Gynoecium having three carpels which are known as called tricarpellary. When these carpels are fused together, it is termed as syncarpous. Also, when there is a single ovule in its chamber, then it is called unilocular. Polycarpellary means that more than five carpels together in gynoecium.
Trilocular is meant for having three locules in the ovary.
So, the correct answer is 'Tricarpellary, syncarpous, unilocular', which is option C.