The correct answer is D) highly polished. A well-lubricated bearing surface will appear highly polished due to the smooth, even distribution of the lubricant. The lubricant helps reduce friction and wear on the bearing surfaces, resulting in a uniformly smooth and shiny appearance. The other answer choices are incorrect because: A) "Well knurled" refers to a textured surface, which is the opposite of a polished appearance. B) "Slightly streaked" suggests an uneven distribution of the lubricant, which is not the case for a well-lubricated bearing. C) "Lightly glazed" implies a thin, uneven coating, rather than a consistently polished surface.