One spot from three faces of the die is lost.
The first view of the die shows that a spot from 4 and a spot from 6 is missing.
The second view shows that a spot from 3 is missing.
Opposite faces must always add up to 7.
1 is opposite 6
2 is opposite 5
3 is opposite 4
This can only be done through visualisation and a LOT OF remembering. Since there are so many options, it is actually very hard to solve this under 2 minutes. Since time is of the essence, I must advise that you skip this question and do the other easier ones first.