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based on its usage in the passage below, what is the best definition for the word tangible?

tom and miss baker, with several feet of twilight between them strolled back into the library, as if to a vigil beside a perfectly tangible body, while trying to look pleasantly interested and a little deaf i followed daisy around a chain of connecting verandas to the porch in front.

a. completely wanting or lacking

b. leave slowly and hesitantly

c. establish or strengthen as with new evidence or facts

d. perceptible by the senses, especially the sense of touch