What is the main idea of this passage?

Câu hỏi: What is the main idea of this passage?

A Searching for wrecks is much easier with new technologies like side-scan sonar.

B Maritime archaeologists are concerned about the unregulated searching of wrecks.

C The search of the RMS Republic failed to produce the hoped-for coins.

D The popularity of treasure seeking has spurred a debate between preservationists and salvagers.