Step 1: In 2006 the WHO launched the new Stop TB Strategy, whose core component is DOTS. So the correct answer is 2006 (option b).
Step 2: The strategy was designed to be implemented over the following 10 years, as set out in the Global Plan to Stop TB 2006 to 2015, with targets and indicators framed within the Millennium Development Goals.
Step 3: Its five principal indicators are case detection, treatment success, incidence, prevalence and deaths. The plan aimed by 2015 to halve TB prevalence and death rates relative to 1990 levels, and by 2050 to bring global incidence below one case per million per year.
Step 4: The other years listed do not correspond to the launch of this strategy, so the answer is 2006.