1. Adobe Premiere Pro User Guide
"Apply
remove
find
and organize video transitions and effects in Premiere Pro":
Section: "Copy and paste transitions": This section explicitly details the correct procedure: "You can copy any transition in a sequence and paste it to any other cut point... Select a transition in a sequence. Choose Edit > Copy... To paste the transition to multiple cut points
select the cut points first. Then choose Edit > Paste." This directly validates option B as the correct workflow for duplicating a transition with its settings.
2. Adobe Premiere Pro User Guide
"Use Adjustment Layers":
Section: "Create adjustment layers": This document explains that "An adjustment layer is a type of video track that you can use to apply the same effect to multiple clips on the timeline." It makes no mention of applying transitions
confirming that adjustment layers are for effects
not for transitioning between clips
which invalidates option C.