Which of the following words is closest in meaning to “Permeable”?

Permeable means allowing liquids or gases to pass through; porous.

• Correct answer - porous: it has the same meaning as Permeable.
• adaptable: able to adjust - wrong, it does not mean the same as Permeable.
• long: measuring a great length - wrong, it does not mean the same as Permeable.
• variable in order: changing in sequence - wrong, it does not mean the same as Permeable.