Who was responsible for the rehabilitation of Sufism in the twelfh century?

B. Al-Ghazali

I'm sorry but whoever said this was the answer; surely is uncertain. I hate to burst your bubble but the correct answer to this question is al-Hallaj (ahl-hah-LAJ).

If you look it up in your text book you're goin to see clearly on page 296 The Progress of Suffism where it says that in the early 10th century,for an instance, ordinary people revered the great spokeman of Sufism, al-Hallaj.

Your welcome!
P.s..reading is healthy...