Why Was the Kyoto Protocol Seen as Obsolete

Why was the Kyoto Protocol seen as obsolete?

A) It exempted most developing countries from having to take action, but economic growth (and corresponding growth in GHG emissions) in those countries, meant that tackling climate change required including them.
B) China was subject to strict restrictions under the Kyoto agreement and refused to abide by them.
C) The United States was subject to strict restrictions under the Kyoto agreement and refused to abide by them.
D) It exempted most developed countries from having to take action, focusing only on developing countries, which, according to economic structuralists, would only prevent them from being able to develop.