Resposta:

[tex]\textsf{Leia abaixo}[/tex]

Explicação passo a passo:

[tex]\mathsf{DEC = BCE}[/tex]

[tex]\mathsf{DE = DC}[/tex]

[tex]\mathsf{BCE = \dfrac{180\textdegree - 45\textdegree}{2}}[/tex]

[tex]\mathsf{BCE = \dfrac{135\textdegree}{2}}[/tex]

[tex]\boxed{\boxed{\mathsf{BCE = 67,5\textdegree}}}\leftarrow\textsf{letra D}[/tex]