SAT Writing question

While still an infant, (the family moved to california where janelle) began surfing at age seven.
(A)the family moved to California where Janelle
(B)the family moved to California while Janelle
©Janelle’s family moved to California where she
(D)Janelle moved with her family to California, where she
(E)Janelle moved with her family to California at which she
…I understand that (A) (B) © are wrong because of wrong modifiers …so it’s either (D) or (E) …the answer is (D) but why is (E) wrong??

California is a place, so “where” is the simplest and most elegant word to use. Furthermore, you don’t say “at California”; you’d say “in California.” So “at which” doesn’t really work.

ohhh thanks so much