All of the Following Statements About Ottoman Expansion Are True

All of the following statements about Ottoman expansion are true except

A) their geographical location gave them a definite advantage for expansion.
B) after taking advantage of Byzantine weakness, they established a base at Gallipoli, and then allied with the Serbs and Bulgars to continue fighting the Byzantine Empire.
C) after the Kurdish seizure of Constantinople in 1521, Ottoman support of the new Kurdish ruler gave them greater control over Asia Minor.
D) as they established European settlements, Turkish beys replaced local landlords, and became the only recipients of taxes collected from the Slavic peasant population.
E) they recruited young Christian boys from the Balkans to serve in elite military guard.