To find the missing pairs of Val's sons who can get a haircut, let’s first write out the pairs that have already been chosen:
- H and C (Hal and Cal)
- H and S (Hal and Sal)
- ? (missing)
- ? (missing)
- C and M (Cal and Mal)
- M and S (Mal and Sal)
The possible pairs of sons from the four boys Hal (H), Cal (C), Sal (S), and Mal (M) are:
- H and C
- H and S
- H and M
- C and S
- C and M
- S and M
Now, we will eliminate the pairs that have already been used:
- H and C
- H and S (already listed)
- C and M (already listed)
- M and S (already listed)
This leaves us with the pairs we still need to find:
- H and M
- C and S
Thus, the completed possible choices with one of them being the missing option:
- H and C
- H and S
- C and S (this correctly fits in " ? " )
- H and M (this fits in " ? " as the second missing option)
- C and M
- M and S
Therefore, the two missing combinations are:
- C and S
- H and M
None of the options you provided fully correspond to the requirement:
- C and S is the valid pair.
- H and M is another valid pair.
So the correct missing pairs are:
- C and S
- H and M.