To find the complementary DNA strand for the original DNA strand (ATC GCT AAT), you should pair each nucleotide with its complementary base, remembering that adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C).
Original strand: ATC GCT AAT
Complementary strand: TAG CGA TTA
So, the correct response is:
TAG CGA TTA