2) All this labeling can be overwhelming. (3) This is why so many people scratch their heads as they try to figure out the difference between natural and organic products.

Without changing the meaning, which of the following best combines sentences 2 and 3?
A.
All this labeling can be overwhelming; therefore, folks in supermarkets all around the world get frustrated as they try to figure out the difference between natural and organic products.
B.
All this labeling can be overwhelming, so this is the exact reason why so many customers scratch their heads as they try to figure out the difference between natural and organic products.
C.
Considering all food is labeled, people in supermarkets scratch their heads as they try to figure out the difference between natural and organic peanut butter.
D.
Because food labels can be overwhelming, shoppers often scratch their heads as they try to figure out the differences between natural and organic products.

D. Because food labels can be overwhelming, shoppers often scratch their heads as they try to figure out the differences between natural and organic products.

Explanation:

The given two sentences talk about the overwhelming nature of labels in food packages. With this dilemma, shoppers are left confused over what is natural and what is organic when buying things. So, for combining the two given sentences without removing any of its meaning, it is important to try to construct the new sentence so as to make the point stick to the original one.

Thus, the best revision for the given two sentences is option D.