Answer:

C (probably)

Step-by-step explanation:

Know:

D and another angle being on of the pairs of same-side interior angles, should add up to 180° (see Transversal Lines). We can also see that both of these angles are congruent to each other, making the expression for each angle unnecessary anymore. If we make the measure of angle D and its pair (which is congruent to it) variable a, then we can make the equation:

°

Simplify...

°

Then we find that angle D measures 90°

Footnote:

Why is the measure of angle D in bold characters? Also palakihin niyo naman po yung image minsan, wala po ba kayong snip & sketch?