With Respect to the Auditory Form of Grouping Known as 'Streaming

With respect to the auditory form of grouping known as 'streaming', which of the following statements is FALSE?

A) Streaming grouping reflects the probability that two components could stem from a single source.
B) When the two frequencies are similar and the interval between the two tones is not too big, the listener hears a melody.
C) A two-tone siren is an example of a train of pulses at different frequencies which are perceived as a single sound.
D) Regardless of the similarity and rate of alternation of two tones' frequencies, listeners will always perceive a train of pulses as a single tone.