In the figure below, ABCD is a trapezium. AF and EC are straight lines.
Peishan wrote four statements to describe the figure. Statement A: $\angle AED = \angle ABC$
Statement B: $\angle EDA = \angle FDC$
Statement C: $\angle ABC + \angle ECB = 180^\circ$
Statement D: $\angle DAB + \angle ABC = 180^\circ$ Which of the following statements are true?

1. Evaluate Statement B

Since $AF$ and $EC$ are straight lines intersecting at $D$, $\angle EDA$ and $\angle FDC$ are vertically opposite angles. Therefore, $\angle EDA = \angle FDC$. Statement B is true.

2. Evaluate Statement C

In trapezium $ABCD$, $AB$ is parallel to $DC$. Since $E, D, C$ are collinear, $AB$ is parallel to $EC$. $\angle ABC$ and $\angle ECB$ (which is the same as $\angle BCD$) are interior angles between parallel lines. Therefore, $\angle ABC + \angle ECB = 180^\circ$. Statement C is true.

3. Identify the correct option

Statements B and C are true. This corresponds to option (3).