Question

The photo shows Alexandria in 1960,................... My parents lived there

Answer 1

The correct option is number 2 "when". The reason is that the author wants to make reference to the year 1960, and the pronoun "when" refers to points in time. The pronoun "there" is used to refer to Alexandria, so option 1 is not correct, rather it is redundant. Option 3 simply does not apply, since the relative pronoun "which" is used to refer to objects.