The best substitutions for the underlined words to improve the paragraph's coherence are 'ones,' 'those plants,' and 'them'.The correct answer is option a.
In creating a more coherent paragraph, consider employing strategic substitutions to enhance clarity and flow. The original paragraph focuses on utilizing plants to attract beneficial bugs and deter harmful pests in a vegetable garden. By substituting the underlined words with "ones, those plants, them," the paragraph gains clarity and consistency. It explicitly refers to the specific plants involved in attracting good bugs and deterring pests.
This helps readers follow the narrative seamlessly, maintaining a clear connection between the ideas presented. The revised paragraph emphasizes the importance of selecting and situating these particular plants strategically to create an effective and pest-resistant garden. This not only improves the coherence of the paragraph but also ensures that readers can easily grasp the gardening tips and apply them for a successful harvest.