Time signals broadcast by WWV and WWVH are transmitted __________.

Correct Answer: Option B — continuously throughout day

NIST radio stations WWV and WWVH provide continuous, 24-hour broadcasts of time signals, standard frequencies, and weather information. These transmissions are vital for mariners to calibrate chronometers and receive updated meteorological data. Per Bowditch, this constant availability ensures that navigators can obtain precise time synchronization regardless of their geographic location.