✅ The primary relationship in the given analogy is that of a "tool and its core function or purpose."

✅ A BRUSH is a tool whose main purpose or function is to PAINT.

✅ Following this exact relationship, a PENCIL is a tool whose main purpose or function is to WRITE.

❌ Option B, HAMMER : NAIL, is less precise because a hammer's direct function is to *strike* or *drive*, not simply the object 'nail' itself.

❌ Option C, BOOK : READ, represents an object and an action performed *on* it, rather than a tool performing its primary action.

❌ Option D, CAR : DRIVE, describes a vehicle and an activity it facilitates, but the car itself does not "drive" in the same active, direct functional sense as a brush "paints" or a pencil "writes."

✅ The first pair, PEN : WRITE, establishes a "function/purpose" relationship, where a pen's primary purpose is to write.

✅ Following this same relationship, the primary function or purpose of a SHOVEL is to DIG.

❌ HANDLE refers to a part of a shovel, not its intended action or use.

❌ METAL describes the material a shovel is typically made from, not its function.

❌ GARDEN indicates a common place where a shovel is used, but not the action it performs.