Where can I place to get the high level signal? any explaination or reference?

An electrically small loop is placed on the XY plane at the origin of coordinates. An elementary dipole oriented along y-axis is placed at different observation points in the XZ plane. Where will you get a higher level of signal?
a) (0, 0, 10)
b) (10, 0, 10)
c) (30, 0, 0)
d) (10, 0, 20)