​Study the given diagram carefully and answer the question. The number in different sections indicate the number of things.

How many such walkers are there that are also highchairs but NEITHER prams NOR strollers?

Red part shows the number of walkers that are also highchairs but NEITHER prams NOR strollers

So, 5 walkers are there that are also highchairs but NEITHER prams NOR strollers.

Thus, Option B is the correct answer.