how is that the answer ? explain please. no coding!

25.In the Powell's conjugate direction search method, if we have xo=(1,1), = (2,5), and x-(7,5), which one shows the new search direction? (21), (The answer, c) . | d) 4 4 4 25.In the Powell's conjugate direction search method, if we have xo=(1,1), = (2,5), and x-(7,5), which one shows the new search direction? (21), (The answer, c) . | d) 4 4 4