Answer: A

Reasoning: In the commonly used Pederson difficulty index for mandibular third-molar surgery, mesio-angular impactions are given the lowest angulation score (1) whereas vertical and horizontal get 2 and disto-angular 3, making mesio-angular cases the least difficult and therefore the easiest to remove (Diniz-Freitas et al., 2007, PMID 16434132). Clinical reviews likewise state that disto-angular impactions are “the most complex,” confirming that the opposite—mesio-angular—requires the least surgical effort (Situt et al., 2024, PMID 39258098).