Possessive Plural vs Singular

Singular or plural?
children's

• singular possessive
• plural possessive

the tails of the cats

• the cat's tails
• the cats' tails
• the cat tails

the clouds of the sky

• the sky's clouds
• the skies clouds
• the skys' clouds

the leg of the table

• the table's leg
• the tables' leg
• the tables's leg

The dog owns a ball. How would you make that a singular, possessive noun?

• The dog's ball
• The dogs ball
• The dogs' ball
• Ball dog

Singular or plural?
boys'

• singular possessive
• plural possessive

The cat's fur is striped. 

• Plural
• Singular Possessive
• Plural Possessive

The women's restroom is full.

• Plural
• Singular Possessive
• Plural Possessive 

The dogs' food is by the door. 

• Plural
• Singular Possessive
• Plural Possessive

the home of the ducks

• the ducks' home
• the duck's home