Final answer:
In the given sentence, 'kindred' means similar publications that share the characteristic of relying on gossip and rumor, making option 1) similar the correct synonym.
Step-by-step explanation:
In the sentence provided, the word kindred is used to describe publications that are similar in nature to the National Surveyor, particularly in their reliance on gossip and rumor rather than facts. Therefore, the synonym for kindred in this context is similar, which is option 1. The other options, 'unrelated,' 'biased,' and 'credible,' do not fit the context of the sentence, as they either denote dissimilarity or attribute different qualities to the publications.