Answer :
the sentence that makes the correct use of tense is : C. Sandra went to collect the tickets which she had booked last week.
In option A . the word 'book' is wrong
In option B. the phrase ' which she would book is wrong'
in option D . 'had been booked' is wrong
hope this helps
In option A . the word 'book' is wrong
In option B. the phrase ' which she would book is wrong'
in option D . 'had been booked' is wrong
hope this helps