The correct answer is: A. 15 kmph.
The IBS home signal is a type of railway signal that is used to indicate whether or not a train is allowed to proceed into a station. When the IBS home signal is in the ON position, it indicates that the train is allowed to proceed into the station at a speed of up to 15 kmph. This speed limit is in place to ensure the safety of both the train and the passengers.
The other options are incorrect because they do not represent the maximum speed that is allowed to pass an IBS home signal in the ON position. Option B, 10 kmph, is the maximum speed that is allowed to pass an IBS home signal in the OFF position. Option C, 8 kmph, is the maximum speed that is allowed to pass an IBS home signal in the DANGER position. Option D, Normal, is not a specific speed limit.
It is important to note that the maximum speed that is allowed to pass an IBS home signal may vary depending on the specific railway line and the conditions at the time. It is always important to check the local regulations before proceeding.