The correct answer is: A. T/103 B
The Signal sighting committee shall submit its report on form T/103 B. This form is used to report the sighting of a signal, and it includes information such as the date and time of the sighting, the location of the sighting, and the description of the signal.
The other options are incorrect because they are not forms that are used to report the sighting of a signal. Option B, T/102 B, is a form that is used to report the sighting of a target. Option C, T/101 B, is a form that is used to report the sighting of a hazard. Option D, None of these, is also incorrect because there is a form that is used to report the sighting of a signal.