The correct answer is D. Germany.
Angelique Kerber is a German professional tennis player. She has won 13 singles titles on the WTA Tour, including three Grand Slam singles titles at the 2016 Australian Open, 2016 US Open, and 2018 Wimbledon Championships. She has also won two WTA Finals titles, in 2016 and 2018. Kerber was the world No. 1 ranked player for a total of 37 weeks, including a streak of 20 weeks in 2016. She has been a member of the German Fed Cup team since 2003, and has helped the team win the title in 2018.
The other options are incorrect.
- Option A is incorrect because Angelique Kerber is not from Australia. She is from Germany.
- Option B is incorrect because Angelique Kerber is not from the United Kingdom. She is from Germany.
- Option C is incorrect because Angelique Kerber is not from Serbia. She is from Germany.