Due to frequent changes in，or varying combinations of，some types of equipment such as avionics and instrumentation,one or more separate documents for these products may be required.

【单选题】
A Some types of equipment such as avionics and instrumentation are often revised or combined differently to require one or more separate documents.
B One or more separate documents for some types of equipment such as avionics and instrumentation may be required because they change frequently or they have various combinations.
C Some types of equipment such as avionics and instrumentation are changed regularly or combined in different forms requiring to have one or more separate documents.

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