Telomerase is an enzyme that is produced only in cells that are actively dividing. For this reason it is generally absent from body tissues in adults. Bone marrow is an exception to this rule, however, since even in adults, bone marrow cells continually divide to replace old blood cells. Cancers are another exception, because their cells are rapidly dividing.

The information provided most strongly supports which of the following?

• ATelomerase is the only enzyme that is present in cancerous cells but absent from cells that are not actively dividing.  
• BIn children, the only body tissues from which telomerase is absent are those in which cells are not rapidly dividing.  
• CThe presence of telomerase in bone marrow is no indication of bone marrow cancer.  
• DCancer of the bone marrow develops more rapidly than cancer growing in any other kind of adult tissue.  
• EThe level of telomerase production is always higher in cancerous tissue than in noncancerous tissue.