The correct answer is D) The engine cylinder head is fitted with replaceable valve seats. This is the correct answer because the illustration MO-0013 shows a cylinder head design that features replaceable valve seats, which allow the valve seats to be replaced when they become worn or damaged. This design is common in marine engines to facilitate maintenance and extend the engine's lifespan. The other answer choices are incorrect because they do not accurately describe the features shown in the illustration. The valve cages are not provided for the exhaust valves (A), the engine does not have a dry liner (B), and a gastight seal is provided by a gasket between the cylinder head and cylinder block, not the cylinder liner (C).