James Watt's Steam Engine Did Not Adapt Well to Transportation

James Watt's steam engine did not adapt well to transportation uses because

A) it weighed too much to be supported by rubber tires.
B) the heat,combined with the vibrations of movement,caused instability in the structural integrity.
C) the engine grew too hot and often exploded.
D) it used too much gasoline to be cost efficient.
E) it consumed too much coal.