The table gives the number of new HIV infections in 1990 and 2021 in one country. Which statement could account for the change in the number of new HIV infections between 1990 and 2021?
- ACondoms, which prevent the transmission of STIs, increased in price between 1990 and 2021.
- BPeople in 2021 had more sexual partners.
- CTesting of donated blood for pathogens was introduced in 1990.
- DThere was an increase in drug abuse between 1990 and 2021.