[单选题]
The Leaning Tower of Pisa is 55 m tall and about 7.0 m in diameter. Thp* uf*0sx 1 tn+jh+qdczfq7v(e to:3 dvyh .kge.db(e )onp is 4.5 m off center. How much farther can it lean before it becomes unstablv. dnh)g .b3okyd e(e:e?
A. $0.5 \; m$
B. $1.5 \; m$
C. $2.5 \; m$
D. $3.5 \; m$