During total interruption of communication on signal line. The speed of LE to establish communication is ________ kmph during day and clear weather. A. 10 B. 15 C. 20 D. None of these

The correct answer is D. None of these.

The speed of LE to establish communication is not a fixed value. It depends on a number of factors, including the type of LE, the terrain, the weather, and the signal strength. In general, LE can establish communication at speeds of up to 20 kmph, but this may vary depending on the conditions.

Option A is incorrect because it is too low. Option B is incorrect because it is too high. Option C is incorrect because it is not a valid option.