The correct option is A Hairpin shaped and 'U' shaped respectively
Henle's Loop
Henle's loop is a hairpin shaped strure which extends into medullary region of nephron. It helps in reabsorption of water and other essential electrolytes.
Vasa recta
Vasa recta is a U shaped minute vessel which runs parallel to Henle's loop in nephrons. It helps in maintainig concentration gradient by addition and removal of water and solutes.
Final answer
(c) Hairpin shaped and 'U' shaped respectively