The fore bearings and back bearings of the lines of an open compass traverse are given below.
| Line | Fore bearing | Back bearing |
|---|---|---|
| PQ | 132°30' | 313°30' |
| QR | 123°30' | 303°30' |
| RS | 182°30' | 2°15' |
| ST | 288°45' | 108°0' |
The stations that are free from local attraction are
(A) P and Q
(B) Q and R
(C) R and S
(D) S and T
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