For the first question, if you draw it out, then the only answer where you would intercept the radial is D.
The answer to your second question: the aircraft is on a heading of 345, established on the 300 radial, therefore the RBI reads 135 degrees.
The relative bearing is where the NDB is in relation to the nose of the aircraft, i.e. the angle between our current heading and the inbound radial = 345 to North to 120 = 15 + 120 = 135 degrees.
Have a go at both questions with the simulator here:
http://www.luizmonteiro.com/Learning_ADF_Sim.aspx
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