Not true

"The jury will select..." is a certainty, therefore B is correct. "May contain" is not a certainty. How is it POSSIBLE Clivestones were chosen, when it's going to be only Clivestone (Steel) or Fillmore (bronze)?

Jay,

The passage says that either Fillmore’s or Clivestone’s sculptures, but not both, will be chosen.

But you have no idea what else will be chosen for the show.
Maybe there will be six other artists who sculpt in bronze, and who's sculptures are displayed.
If that were the case, then there may be bronze sculptures shown even if Clivestone’s sculptures are shown (which would mean that steel sculptures MUST also be shown in addition).

I still do not understand. Based on the passage it sounds like it's either/or, and not either/or and maybe some others.

Jay,

You've gotta be careful here. The passage says:
"If Fillmore’s sculptures are chosen, then the show will contain bronze works. If Clivestone’s sculptures are selected, the show will contain sculptures made from stainless steel."

It doesn't say that Clivestone's sculptures ARE steel, or that Fillmore's ARE bronze.

It says:
1. Fill or Clive, not both
2. Fill → some bronze sculptures will be shown
3. Clive → some steel sculptures will be shown

What we know here is that we can't have Fill + Clive, but we must have one of the two.

If we have Fill, we know we MUST have some bronze sculptures at the show, and we know we CANNOT have Clive's art at the show. But we have no idea about anything else. Maybe there will be someone named Becky who shows up with steel sculptures. Who knows?

You just have to read carefully, and make sure you don't assume too much.
If this is confusing, take another look at the argument, and then have another look at the premises diagrammed above (labeled 1, 2, 3).

I think some sentence correction is needed in the passage.. Modifiers "choose" and "selected" should be placed near the subjects . It should state as following..

Show would choose stainless steel sculptures from Clive and bronze sculptures from Fill if they are selected.

Then the premise map would make sense.