Mya claims (m∠3 + m∠4) = m∠1 Which equations explain why Mya's claim must be true?

A:(m∠1 + m∠2) = 90° and (m∠3 + m∠4) = 90°
B:(m∠1 + m∠2) = 180° and (m∠3 + m∠4) = 180°
C:(m∠1 + m∠2) = 90° and (m∠3 + m∠4 + m∠2) = 90°
D:(m∠1 + m∠2) = 180° and (m∠3 + m∠4 + m∠2) = 180°