The correct answer is answer 4 ("The use of religious ideas to legitimize Ottoman rule in Christian lands").
The frescoes were painted at Moldovita's Voronet Monastery in Romania in 1537 by Toma of Suceava. They're impressively well-preserved to this day, with yellows and blues that still shine through. Thematically, the paintings represents procession, ancestry and other Christian iconography such as portraits of saints.
"The Siege of Constantinople", specifically, depicts the intervention of the Virgin in saving Constantinople from Persian invasions.
Hope this helps!