Which of the following accurately completes the missing statement and justification of the two-column proof? m∠BEC + m∠CED = m∠BED; Definition of a Linear Pair

m∠ABC + m∠BEC = m∠BED; Angle Addition Postulate

m∠ABC + m∠BEC = m∠BED; Definition of a Linear Pair

m∠BEC + m∠CED = m∠BED; Angle Addition Postulate