Here are the corrections needed for each sentence:

37. **A** (should be "A police officer" instead of "An police officer")

38. **B** (should be "lying" instead of "lying" since "lying on the beach" is appropriate but "lying" is used incorrectly in the context)

39. **A** (should be "far from" is correct, but the sentence structure is awkward, may need editing for clarity)

Therefore, the answers are:
- 37: **A**
- 38: **B**
- 39: **A** (for awkward structure)