NO-ONE got this question right! Explaining Q4 of BMQotD

For some reason everyone got this question wrong so here's a quick explanation of how to arrive at the correct answer for this Bending Moment Question of the Day. The original question video is here:    • #4 | HARD | Portal Frames | Bending Moment...   . . I highly recommend reading "Understanding Structural Analysis" by David Brohn, which is a very graphical way to learn structural behaviour, unlike any university degree will teach you. Buy it here: https://amzn.to/35DxxIP