Option D doesn't even cover an open circuit, one of the two basic categories of main faults (shorts and opens).
A fault by definition is any situation where the resistance between the current carrying conductors themselves and/or the neutral and/or ground decreases to where current begins to flow through the resistance. A dead short is one example, a squirrel (also dead) is an example of a partial fault.
Notice that an open would not fall into this definition and should not be referred to as a fault.
Answer "D" is correct.
-Hal
