Fill in the blank given below using the correct idiom.  Despite his initial doubts, joining the painting class turned out to be _______________ as he discovered a hidden talent.

The phrase "a blessing in disguise" means that something initially perceived as unfortunate or negative actually turns out to be beneficial in the long run. (A) the last straw: The final event that causes someone to reach a breaking point. (B) a blessing in disguise: Something initially perceived as unfortunate but turns out to be beneficial in the long run. (C) pushing his luck: To take a risk by relying on good fortune that might not continue. (D) worth its weight in gold: Something of great value or usefulness. (E) rolling up his sleeves: To get ready to work, especially on a task that requires effort.