An appropriate sensory-motor activity for a child up to eight months of age is A. touching toys of different shapes, sizes, and textures. B. playing with puzzles with a few large pieces. C. drawing with crayons or markers. D. stringing large beads on a shoelace. 

Yikes! An eight-month-old can only do one of these activities.

Which one is it?

A. touching toys of different shapes, sizes, and textures.

Correct.

To determine an appropriate sensory-motor activity for a child up to eight months of age, it is important to consider their developmental stage and capabilities. At this age, infants are beginning to explore their environment through their senses and are developing their fine motor skills. Here's how you can arrive at the answer by reasoning through the options:

A. Touching toys of different shapes, sizes, and textures: This option stimulates the child's sense of touch, allowing them to feel different sensations. It also encourages them to grasp and manipulate objects, developing their fine motor skills. Therefore, option A seems like a suitable choice.

B. Playing with puzzles with a few large pieces: While puzzles can be beneficial for older children, infants up to eight months of age may not have the dexterity or cognitive skills necessary to engage with puzzles. Hence, option B is not appropriate for this age group.

C. Drawing with crayons or markers: Around eight months of age, infants may begin to explore mark-making with crayons or markers, but it is not typically a common activity at this stage. Also, their motor skills are still developing, making it challenging for them to create controlled drawings. Thus, option C is less suitable.

D. Stringing large beads on a shoelace: Stringing beads requires more advanced fine motor skills and hand-eye coordination, which infants are unlikely to have developed at this stage. Thus, option D is not a suitable activity for children up to eight months.

By examining each option and considering the developmental milestones, we can conclude that option A, touching toys of different shapes, sizes, and textures, is the most appropriate sensory-motor activity for a child up to eight months of age.