In the darkness P : the long, narrow beard Q : was clearly visible with R : the tall stooping figure of the doctor S : and the aquiline nose The Proper sequence should be:

The correct answer is: A. RQPS

The sentence is about the tall stooping figure of the doctor with a long, narrow beard and an aquiline nose. The correct sequence of the sentence is:

1. In the darkness, the tall stooping figure of the doctor was clearly visible.
2. The doctor had a long, narrow beard.
3. The doctor also had an aquiline nose.

The other options are incorrect because they do not follow the correct sequence of the sentence. For example, in option B, the sentence starts with “the long, narrow beard”. However, the beard is not visible until the doctor is described as being tall and stooping. In option C, the sentence starts with “the tall stooping figure of the doctor”. However, the doctor is not described as being tall and stooping until the beard is mentioned. In option D, the sentence starts with “the aquiline nose”. However, the nose is not visible until the doctor is described as being tall and stooping.