Correct option is D

Gross motor skills involve the use of large muscle groups and the coordination of movements that require strength, balance, and control of the whole body. Walking and running are activities that rely heavily on gross motor skills.
These activities engage the major muscle groups of the legs, such as the quadriceps, hamstrings, and calf muscles, along with the core muscles for stability. Walking and running also require coordination between the legs, arms, and the body's overall balance to maintain an upright posture and propel oneself forward.
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In contrast, the other options primarily involve fine motor skills rather than gross motor skills. Painting on a paper using a brush (option a) and cutting and pasting bits of paper (option b) involve precise movements of the hands and fingers, which are characteristic of fine motor skills. Threading a needle (option c) also requires fine motor skills, as it involves delicate hand-eye coordination and manipulation of the thread through the small eye of the needle. These activities focus on precise and controlled movements of the small muscles, rather than the large muscle groups involved in gross motor skills.