Mutations in MicroRNAs Can Explain Families Who Have Different Cancers

Multiple Choice

Mutations in microRNAs can explain families who have different cancers but do not have mutation for known family cancer syndrome genes because

A) microRNAs are specific to families.
B) a single type of microRNA can have many targets.
C) microRNAs also serve as oncogenes.
D) exposure to different environmental toxins triggers transcription of particular microRNAs.
E) they caused reversion of the family cancer syndrome mutations.