Q:

Statements: 
Some owls are ostriches.
Some ostriches are crows.
Some crows are black.
Conclusion: 
1. Some owls are black.
2. No ostrich is black.
3. No owl is black.
4. Some ostriches are black. 

• 1
  Either 2 or 4
• 2
  Only 1 and 2 follow.
• 3
  Either 1 or 3 and either 2 or 4
• 4
  Either 1 or 3