Final answer:
The correct answer is option d. 2002.
Step-by-step explanation:
The legalization of prostitution in Germany occurred in the year 2002. This was a significant shift in the legal regulation of the sex industry, and placed Germany among the countries that regulate and monitor prostitution rather than criminalizing it.
Prior to this change, prostitution was in a legal grey area in Germany, but the new laws implemented in 2002 sought to improve the legal and social status of sex workers, including provisions for health insurance, the right to enter into employment contracts, and access to social security and job centers.