Which statement is true? Will choose brainliest.

Answer:
A. [tex]m\angle a = 72\degree[/tex]
Step-by-step explanation:
[tex]m\angle a \: \angle c [/tex] are vertical angles.
Vertical angles are congruent.
[tex]\implies m\angle a = 72\degree[/tex]
Hope it helps you in your learning process.