Yeast Mitochondria Have a Tubular Morphology

Yeast mitochondria have a tubular morphology.In a mutagenic screen,two mutants are isolated that have fragmented mitochondria instead of tubular mitochondria.To determine if these two mutations are at the same or different loci,the two mutants are crossed.The progeny all have tubular mitochondria.What do you conclude?

A) The mutations are at different loci.
B) The mutations are at the same locus.
C) Not enough data is presented.