Long distance short-wave radio broadcasting uses:
A. Ground wave
B. Ionospheric waves
C. Direct wave
D. Sky wave

Hint:To solve this question, we need to know what the long distance short wave radio broadcasting is. The radio transmission which uses shortwave radio frequencies for transmitting signals to long distance is called the long distance short wave radio broadcasting. Now, to know which type of wave is used in this, we need to know how the transition takes place while this type of radio broadcasting.

Complete answer:
We know that the use of short wave long distance radio is to broadcast music and voice to shortwave listeners over very large areas. This range may include the area over the entire continents or beyond. Moreover, this can be used in military radar, diplomatic communication. Its further uses include two-way international communication for hobby, education, and emergency service, as well as for long-distance aviation and marine communications.

In long distance short wave broadcasting, shortwave bands can be reflected or refracted from the ionosphere which is defined as a layer of electrically charged atoms in the atmosphere called. Due to the path of this wave from the ionosphere, they are called the ionospheric waves. Thus, we can say that the long distance short-wave radio broadcasting uses ionospheric waves.

Hence, option B is the right answer.

Note:Here, we have seen that the long distance short-wave radio broadcasting uses ionospheric waves. Its frequency energy is capable of reaching any location on the Earth because it is influenced by ionospheric reflection back to the earth by the ionosphere. In this type of broadcasting, there may be a chance of the occurrence of a skip zone where reception fails. This is due to factors like large changes in ionospheric conditions or fixed working frequency,