1. (1 point) The merry-go-round shown below is found in the Seward Park playground in Seattle, Washington. The diameter of the merry-go-round is 8 feet. The center of rotation for the merry-go-round is at the origin, with the z direction vertical. The boy in the white and red coat is applying a force F whose moment about the origin is given by Mo=3-4+5 lb-ft. What is the moment caused by F about a vertical line upward through the origin? A. -5 lb-ft B. -4 lb-ft C. -3 lb-ft D. 3 lb-ft . E. 4 lb-ft F. 5 lb-ft O B. B O C. C O D. D O E. E O F. F