The knuckle joints are formed by articulations between the metacarpals and the

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Consider the anatomy of the hand joints and where the 'knuckles' lie. 
Option 1: lunate. The lunate is a carpal bone located in the proximal row of the wrist, not the articulation that forms the knuckles between hand bones. This makes this choice inaccurate for the knuckle joints. 
Option 2: proximal phalanges. The knuckle joints, medically known as the metacarpophalangeal (MCP) joints, are formed where each metacarpal articulates with the proximal phalanx of the corresponding finger. This is the correct anatomical relationship that creates the knuckle region you can palpate. 
Option 3: distal phalanges. The distal phalanges are the bones at the tips of the fingers; they articulate with the middle phalanges at the distal interphalangeal joints, not with the metacarpals to form the knuckles. This option confuses the location of the knuckle joints. 
Option 4: carpals. While the metacarpals do articulate with the carpal bones at the carpometacarpal joints, the classic "knuckles" refer specifically to the MCP joints between metacarpals and proximal phalanges, not the carpals themselves. Therefore this option does not describe the knuckles accurately.

BIOL-2-40677-F25 Quiz 3 (Chapter 8)

The knuckle joints are formed by articulations between the metacarpals and the

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