The correct response is:
Yes, because the trees in the sample are chosen randomly. The sample size also appears to be large enough to avoid bias.
This choice is the most valid because the farmer selected her sample randomly, which helps eliminate bias in the selection of trees. Moreover, a sample size of 700 is typically considered large enough to make reliable generalizations about the entire population of 12,000 trees, assuming the sample is representative. The other options either misinterpret the relevance of the sample size or incorrectly suggest that not including all trees invalidates the generalization.