Final answer:
The statement 'Haller's success set a new standard for excellence' best emphasizes Haller's achievement by indicating its significance and pioneering nature in the field.
Step-by-step explanation:
To most effectively and specifically emphasize Haller's achievement as described in the essay, the statement (c) Haller's success set a new standard for excellence would be the most suitable choice. This option not only acknowledges Haller's success but also indicates that it was significant enough to redefine what was considered excellent in the field. By using this statement, we can infer that Haller's achievements were not only great but also pioneering, serving as a benchmark for others in the same field.