With reference to the blood in a normal person, which one of the following statements is correct

(a)

Compared to arteries, veins are less numerous and hold less of the body’s blood at any given time

(b)

Blood cells constitute about 70 per cent of the total volume of the blood

(c)

White Blood Cells (WBC) are made by lymph nodes only

(d)

The blood has more platelets than WBC