6807. It is so gratifying to know that there are not many small-pox cases these days.

✅ The correct answer is option C.
Displease : make (someone) feel annoyed or upset.

Surprising : causing surprise; unexpected.

Satisfying : giving fulfilment or the pleasure associated with this.

Happy : feeling or showing pleasure or contentment.

Gratifying : giving pleasure or satisfaction.

Synonym of Gratifying is Satisfying