Which is the best claim for an argumentative paragraph that discusses why the marine chronometer is the most historically important object? The chronometer is the most historically significant object because it was used by explorers in the 1800s. The chronometer is the most historically significant object because it was more important than the other objects in MacGregor’s text. The chronometer is the most historically significant object because Captain Cook used it in his voyage around the world. The chronometer is the most historically significant object because it established a standard measure of time and position.