Who among the following expounded the concept of Wahdat al-Wujud (Unity of Being)?

Correct option is C

The concept of Wahdat al-Wujud (Unity of Being) was expounded by Ibn al-Arabi.

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Ibn al-Arabi (1165–1240 CE), a renowned Andalusian Sufi mystic and philosopher, is the primary figure associated with and the most influential expounder of the doctrine of Wahdat al-Wujud.
The concept asserts that God (the Ultimate Reality) is the only truly existent being and that the entire universe, including all creation, is merely a manifestation, reflection, or mode of His being. It essentially views the world as the appearance of a single, indivisible reality.