Context: $l \parallel k$, transversal $j$. $64°$ at $k$, $a°$ at $l$. Co-interior angles.

Answer: C: $116$

Why: Co-interior: $a + 64 = 180$, so $a = 116$.

Traps: A ($26$) gives $26+64=90$ (complementary, not supplementary). B ($64$) assumes corresponding. D ($154$) arithmetic error.