Which was a declining muslim empire in the middle east the most prominent declining islamic empire in the early 20th century was the ottoman empire, however, [ the qajjar and safavid empires had also been in decline during the same period in iran. ]

Ottoman empire   was a declining muslim empire in the middle east the most prominent declining islamic empire in the early 20th century  ottoman empire was dominant power in sunni islam since 15th century therfore it's decline is proper answer for sure

The answer is a and hi how are you doing