In each question below, a sentence is given, divided into five parts (1, 2, 3, 4, 5) which when rearranged will form a logical and coherent sentence. One of the parts does not belong to the sentence. Identify the part that does not belong and rearrange the remaining parts to form a meaningful sentence. Choose the correct arrangement.  1. allowing architects to distribute immense structural weight outward rather than relying solely on massive, restrictive load-bearing walls   ​2. the perfection of the flying buttress during the High Gothic architectural period represented a monumental engineering breakthrough   ​3. thereby enabling the construction of soaring cathedrals characterized by cavernous naves and expansive stained-glass fenestrations   ​4. aggressive fiscal tightening often leads to a temporary contraction in overall industrial output and consumer spending   ​5. completely redefining the spatial and aesthetic possibilities of religious monuments across medieval Europe