Dyspepsia is commonly called as stomach upset due to indigestion mainly in the upper abdomen.
Hence the option b is not correct.
Dyspareunia refers to the pain during the intercourse primarily on the external surface of the genitals.
Hence the option a is not correct.
Vaginismus is termed as the unwanted involuntary spasms of the vaginal muscles that interfere with intercourse or vaginal insertion.
Hence the correct option is.