Question 3520 Deck General

The correct answer is B) 100 feet. The American Petroleum Institute (API) recommends checking the length over 5 links of an anchor chain every 100 feet. This is to ensure the integrity and safety of the anchor chain, which is critical for secure anchoring of vessels. Checking the chain at regular intervals helps identify any potential wear, damage, or defects that could compromise the chain's strength and reliability. The other options are incorrect because 10 feet is too frequent, 250 feet and 500 feet are too long of intervals, and may not provide adequate monitoring of the anchor chain's condition.