Question

the worldwide spread of sexually transmitted infections (stis) has been fueled by: monogamy. modern medicine. easy access to global travel. frequent testing for stis.

Explanation:

Monogamy reduces STI spread. Modern medicine and frequent testing help in diagnosis and treatment, not in spreading. Easy access to global travel increases the movement of people, facilitating the spread of STIs as it allows for more sexual interactions across different regions.

Answer:

easy access to global travel.