The correct answer is (b). The air crash which occurred in April 2010 and resulted in the death of the President of Poland, took place in Russia.
The plane, a Tupolev Tu-154M, was carrying Polish President Lech KaczyÅski, his wife Maria, and 95 other high-ranking Polish officials, including the chief of the Polish army, the head of the Polish parliament, and the president of the National Bank of Poland. The plane was on its way to commemorate the 70th anniversary of the Katyn massacre, when it crashed near Smolensk, Russia. All 96 people on board were killed.
The cause of the crash is still under investigation, but it is believed that the plane was caught in a severe snowstorm and lost control. The crash was a major tragedy for Poland, and it is still mourned by the Polish people.
Option (a) is incorrect because the crash did not take place in Poland. The plane was on its way to Poland when it crashed in Russia.
Option (c) is incorrect because the crash did not take place in Germany. The plane was on its way to Poland when it crashed in Russia.
Option (d) is incorrect because the crash did not take place in Italy. The plane was on its way to Poland when it crashed in Russia.