Im Indian and this makes no sense sorry :(
I think that what you are asking is which word is a subject complement in that sentence. What I think the answer to this question is the word third.
Social and political problems such as discrimination, violence, inequality, conflict, insecurity, poverty and environmental damage are just some of the challenges that are creating a human rights crisis across the region

Because the ladder was in flat position not in slant.

Read this excerpt from Beowulf, in which Unferth, one of Hrothgar's warriors, addresses Beowulf. Art thou that Beowulf with Breca did struggle, On the wide sea-currents at swimming contended, Where to humor your pride the ocean ye tried, 'Twas mere folly that actuated you both to risk your lives on the ocean.