What would this be? All alphabetical letters are answers but which do I pick ? And the bottom one with the question marks are all the same options as obtuse , right and acute

Answer:
as in attached pic. last qn would be "right"
Step-by-step explanation:
Answer:
1. C.
2. B, C
3. B, D
Step-by-step explanation:
1. C. rectangle
2.
[tex] B.\triangle ABC\\
C. \triangle CDA[/tex]
These triangles are [tex] \boxed{right} [/tex] triangles.
3.
[tex] B.\triangle DCB\\
D. \triangle BAD[/tex]
These triangles are [tex] \boxed{right} [/tex] triangles.