select the letter of the position that the

phrase in quotes should occupy in the diagram:
The runner tried "to move very quickly

within the space of just a few seconds."

Unfortunately, you did not provide a diagram for reference. However, if you are asking about the position of the letter indicating where "to move very quickly" should be placed within a diagram, it would depend on the specific instructions and structure of the diagram. Without further details, it is not possible to determine the letter or position in the diagram. Please provide more information or a visual representation of the diagram for a more accurate response.

To determine the position that the phrase "to move very quickly" should occupy in the diagram, we need more information about the diagram itself. Could you please provide additional details or context about the diagram?