Explanation:

- The word "knotty" means something that is complex, difficult, or tangled.

- Option 1: easy

- This stands for something simple and straightforward.

- It is the opposite of complex or difficult.

- Correct Answer

- Option 2: involved

- This refers to something complex or complicated.

- It shares a similar meaning to "knotty."

- Option 3: intricate

- This means detailed and complex.

- It's also similar in meaning to "knotty."

- Option 4: assuming

- This means taking something for granted or based on an assumption.

- It’s unrelated in meaning to "knotty."