Industrial refers to areas or zones related to industries or factories, making it the most suitable word for the context where factories are being mentioned.
| Options | Meaning |
| Industrious | Describes a person as hardworking or diligent, not a suitable fit for the context of areas or factories. |
| Mechanical | Relates to machines or mechanisms, which doesn't directly refer to an area with factories. |
| Serviceable | Means something that is functional or in working condition, not related to areas or factories. |
Thus, the correct answer is industrial.
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