The correct option is D Install good amenities to prevent littering of dirt and garbage.
The arrangement of safe transport, general security, fairly good amenities, availability of good accommodation, and good restroom facilities on travel routes etc., help in promoting Tourism. Construction of ramps, special needs parking spaces and special washrooms ensure that the needs of the differently abled are taken care of. Criminal activities such as defacing or vandalising heritage monuments or sites, must be penalised to preserve sites of historical and cultural importance.
Brochures and pamphlets to tourists should be published in several languages for the comfort of tourists.