Graduate Pharmacy Aptitude Test (GPAT) 2011 Solved Paper

Given are the four statements about NMR:
[P] 13CMR is a less sensitive technique than PMR
[Q] Both 13C and H have l=1∕2
[R] Precessional frequency of the nucleus is directly proportional to the applied magnetic field
[S] Deuterium exchange studies can be performed to ascertain protons attached to heteroatoms.
Choose the correct combination of statements.