Option 1 -> Skillful means having or showing skill and proficiency, which is a direct synonym of deft.
Option 2 -> Clumsy means awkward or lacking coordination, which is actually the opposite of deft.
Option 3 -> Vague means unclear or indefinite, which is unrelated to the meaning of deft.
Option 4 -> Humble means modest or unassuming, which has no connection to deft.
Hence, Option 1: Skillful -> "Deft" describes someone who is quick, neat, and skillful in their movements or actions, making "skillful" the perfect synonym -> correct