<em>The answer is</em> The Great Retreat
<em>I hope this helps </em>
All of the above, my dude.
Ok, so obviously, you can tell that A. is not even an answer since his name is Prince Henry which is an English name and the Islamic empire never really reached what is now present-day U.K...B. and D. are wrong because Catholicism was in Spain and the Pope was also in Spain. So your only correct answer is C.
Perestroika is a series of political and economic reforms in the late 1980s implemented by President Mikhail Gorbachev to improve the economy of the Soviet Union. The main objective of Perestroika was to make socialism function more competently in order to fulfill the needs of the Soviet people. Following this information, the correct option is: <em>C. restructuring of the Soviet political and economic system</em>. It is also important to quote that "Перестройка/Perestrojka" in english means "restructuring".