Answer:
B) 250°.
Explanation:
1) if to perform the additional 'building', then it is possible to calculate the measure of the required arc;
2) m∠CTU=m∠CVU=90°, then m∠TCV=360°-( m∠CTU+m∠CVU+m∠TUV) and m∠TCV=360°-(90*2+70)=110°;
3) the measurement of the orange arc TV=360-m(black arc TV); ⇒ m( orange arc TV)=360-110=250°.