Final answer:
The sentence concluding the student's paragraph effectively summarizes and reinforces Theodore Roosevelt's contributions to conservation by detailing his achievements in land preservation during his presidency. Options B and D are correct.
Step-by-step explanation:
Theodore Roosevelt's accomplishments in conservation are effectively concluded with the sentence that highlights his foresight which led to the preservation of over 203 million acres of land during his presidency. This sentence serves as an effective conclusion because:
- B. It provides additional information by summarizing the magnitude of Roosevelt's achievements in land preservation.
- D. It reinforces the information in the paragraph by encapsulating the outcomes of Roosevelt's efforts, mentioned throughout the paragraph, such as establishing national forests, parks, and wildlife refuges.
The sentence does not indicate a sequence, nor does it primarily serve to spur the reader into action, which excludes options A and C.