Answer:
D. inform about the effect of large food companies on small farms.
Explanation:
This selection of the text has cause-and-effect text structure describing the effect (decrease in number of family-run farms) and then its cause i.e. establishment of large good companies such as Tyson. So option D is correct.
Options A and B are incorrect because the tone is neutral and unbiased.
Option C is incorrect because the selection is not entertaining but informative giving information about an effect and its cause.