The blood flows strictly via a fixed route through blood vessels. There are three types of blood ves

Question

The blood flows strictly via a fixed route through blood vessels. There are three types of blood vessels - arteries, veins and capillaries. Study the transverse section of blood vessels $A$ and $B$ given below and answer the following question.\ Which of the following shows correct difference between $A$ and $B$ ?\

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(d)