The correct option is B Syphilis
Measles is caused by a virus and is a communicable disease, spreads by the airborne route.
Diphtheria spreads from person to person usually through respiratory droplets (coughing or sneezing).
Syphilis is a sexually transmitted infection caused by the spirochete bacteria, Treponema pallidum.
Cancer cannot be transmitted by air or water or sexually. it is mainly caused due to mutagens.
Thus, the correct answer is option B.