When a relationship's degree is more than binary (ternary and 4-ary....) and there is more than one arraw then in literature it is interpreted in two ways.
1st interpretation:
Since S has arrow it is interpreted as
for every PQT there is atmost one S [ PQT S]
Since T has arrow it is interpreted as
for every PQS there is atmost one T [PQS T]
2nd interpretation:
Since S, T have arrows, in this interpretation it is interpreted as PS and PT and QS, QT
Since there are two interpretations if you follow first interpretation then Answer is (A) and if you follow 2nd interpretation then it is (B).
Hence , both of the options are true.