When combining length and diameter, what is the measurement range for first class package international service rolls?

The measurement range for first-class package international service rolls is accurately represented by the option that specifies dimensions from 6 3/4 to 42 inches. This range is critical as it outlines the requirements for packaging in international shipping using this service, ensuring that parcels meet postal guidelines for size.

In the context of shipping, the length and diameter measurements are significant for determining the type of packaging that can be efficiently processed and handled by postal services. The specified dimensions ensure that packages can be accommodated within postal system constraints, allowing for appropriate handling during transit.

The other options mention dimensions that fall outside the commonly accepted guidelines for international shipping rolls, which could limit the mailability or incur additional fees due to non-compliance with established standards. Thus, the correct response confirms the understanding of the dimensional requirements necessary for first-class package international service rolls.