C) We will develop anti-aging treatments due to increased funding of SENS and similar projects. Combine that with a universal basic income and robots and you get a much better picture of the future.

Edit: we are also not taking into account artificial gestation methods that may be developed in the next 100 years. In 2120 it may seem as barbaric as child labor and other 19th century atrocities to actually have a woman carry through a pregnancy, not to say that religious fundamentalists will want to continue the practice.