Final Answer:
According to data the correct statement is b) Brand D has the highest overall rating.
Step-by-step explanation:
To determine the overall rating, we sum up the ratings in each category for each brand. The brand with the highest total is considered the best.
Brand A:

Brand B:

Brand C:

Brand D:

Among the given options:
a) Brand A is not the preferred choice in all categories as it has a rating of 3 in the second category.
b) Brand D has the highest overall rating (14), making this statement true.
c) Brand B is not consistently rated the worst as it has a rating of 3 in the first and third categories.
d) Brand C is not the best buy based on ratings as Brand D has a higher overall rating.
In summary, the correct statement is b) Brand D has the highest overall rating.