help needed with this paragraph

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01b001.02b00 In 1918, the Croats, Serbs and Slovenes formed a kingdom known, after 1929, as Yugoslavia. Following World War II , Yugoslavia became a non- aligned communist state under the strong hand of Marshal Tito. After his death in 1980, Yugoslavia began gradually breaking up. 01i00_______02i00 . However, it took four years of occasional and often bitter fighting before they fully achieved it.02br
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00a- 02b00Today, Yugoslavia has been divided into a number of independent countries.02br
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01b00b- 02b00It seemed that only Tito was strong enough to hold together a number of mutually hostile nationalities.02br
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01b00c- 02b00Yugoslavia's first ruler had been King Alexander, a Serb who made himself sole ruler.02br
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01b00d- 02b00Croatia was one of those to declare its independence from Yugoslavia02br
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01b00e- 02b00Only Serbia and Montenegro continue to use the name "Yugoslavia".02br
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00which one is the correct choice?02br
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00thanks...0-