How are these terms related? plausible : believable synonym antonym neither a synonym/antonym, but related unrelated skip?

I think the correct answer would be the first option. The terms plausible and believable are synonyms. Plausible means something that is probable, acceptable, it is likely true. Believable would mean the same as well, it is something that is realistic, credible or acceptable. Words or phrases that means the same are synonyms.

Early 18th century british industries were generally small scale and relatively unsophisticated. most textile production, for example, was centred on small workshops or in the homes of spinners, weavers and dyers: a literal ‘cottage industry’ that involved thousands of individual manufacturers. such small-scale production was also a feature of most other industries, with different regions specialising in different products: metal production in the midlands, for example, and coal mining in the north-east.two illustrations of 18t