Good morning,

For Parts B anc C, you could build each of these parts as single 10-point essay questions and include both question options. Then students would select and answer one of the two questions provided for the part and indicate which option they chose in their response.

I have built tests this way to include a similar element of student choice (rather than students randomly being given one of the two questions as they would if this were set up as a question block), and it has worked well.

Best!
Melissa