Mary grows hundreds of fruit trees in her orchard. The trees range in age, size, and type. Mary's neighbor states, "Now that Mary has listened to my advice, 93% of her trees are bearing fruit." What makes this conclusion difficult to evaluate

There is missing background information.

Explanation:

From the three available sentences in the questions, there is very little connections between them, they are all disjointed, with no actual story to link them together. The sentences are just fragments. Hence, there is no BACKGROUND INFORMATION that describes or explains the three sentences.

Therefore, the right answer is, There is missing BACKGROUND INFORMATION.

"social stratification refers to the way people are ranked and ordered in society. in western societies, stratification is primarily seen and understood as a result of socioeconomic status, which produces a hierarchy in which access to resources, and possession of them, increases from the lower to the upper strata"