If an artisan has to make many products of the same design which tool will be useful?

Correct answer: Template or measurement sample

The direct answer is option D: a template or measurement sample is useful for making many products with the same design. A template is a fixed guide or pattern; a measurement sample is a correctly made model used for comparison. The reasoning is: first make or select one accurate design; mark its dimensions and important shapes; place the template on each new piece or compare each piece with the sample; adjust the work when necessary; repeat the process. This keeps size, proportion and design more uniform and reduces avoidable mistakes in repeat orders. Option D is correct because it provides a reliable reference. Option A is wrong because guessing without measurement causes variation. Option B is wrong because a new size every time defeats the required sameness. Option C is wrong because memory is not a precise measuring tool. Memory cue: repeat design needs a repeatable guide.