Final answer:
CML (chronic myeloid leukemia) demonstrates the presence of the Philadelphia chromosome.
Step-by-step explanation:
The form of leukemia that demonstrates the presence of the Philadelphia chromosome is A. CML (chronic myeloid leukemia). The Philadelphia chromosome is an abnormality in chromosome 22 that results from a translocation between chromosomes 9 and 22. This chromosomal abnormality is specifically associated with CML and is not found in the other forms of leukemia.