Vanderhoven7:
Which sentences are technically correct
1 The Watchtower keeps changing its doctrines.
2. The Watch Tower keeps changing its doctrines.
3. The Watchtower Society keeps changing its doctrines.
4. Watchtower keeps changing its doctrines.
5. Watch Tower keeps changing its doctrines.
6. The Society keeps changing its doctrines.
7. The Watchtower organization keeps changing its doctrines.
8. The Watch Tower organization keeps changing its doctrines.
Of the options provided, the most accurate option is not listed. The primary corporation is the Watch Tower Bible & Tract Society of Pennsylvania. The correct shorthand for that is the Watch Tower Society, therefore your preferred text should be "The Watch Tower Society keeps changing its doctrines".
1 is either a) the magazine or b) too informal and the wrong corporation
2 is close but informal
3 is the New York corporation that administers matters specifically for the US (CCoJW is also a subsidiary in the US, with similarly named subsidiaries in some other countries)
4 is too informal and the wrong corporation
5 is close but informal
6 is too general, unless it follows recent mention of either "Watch Tower Bible & Tract Society of Pennsylvania" or "Watch Tower Society" and without also mentioning the Watchtower Society, some other Society, or society generally.
7 is informal and the wrong corporation, and the inclusion of "organization" comes across as JW jargon
8 is informal and has the same issue re "organization" as for 7