Final answer:
Patricia needs to purchase 1/3 more of the fabric, which is the remaining amount needed to complete the whole fabric required for her project.
Step-by-step explanation:
Patricia already has 2/3 of the fabric she needs. To determine how much more fabric she needs, we consider that the total amount of fabric needed for the project is a whole, which is equivalent to 3/3. She already has 2 parts out of these 3 parts, so she needs to purchase 1 more part to make a whole. Subtract the fraction representing the fabric she already has (2/3) from the total fabric required (3/3):
3/3 - 2/3 = 1/3
Therefore, Patricia needs to purchase 1/3 more of the fabric to have all the fabric she needs for her tablecloth decoration.
The correct answer is A. 1/3.