Correct Answer - B
Join CD and EB
`angleACD=angleAED=50^(@)` (angles in the same segment and `angleAED=50^(@))`
`angleACB=60^(@)` (given)
`rArr angleDCB=angleACB-angleACB=60^(@)-50^(@)=10^(@)`
`angleDEB=angleDCB=10^(@)`. (angles in the same segment).