Final answer:
1S-borneol contains one chiral carbon, which qualifies as a single stereocenter. The correct answer to the question is B) 1.
Step-by-step explanation:
The student asked how many stereocenters are present in 1S-borneol. The molecule borneol contains a cyclic structure, and within this structure, there is one carbon atom that is attached to four different groups. This carbon is a chiral carbon, which qualifies as a stereocenter. Therefore, 1S-borneol has only one stereocenter, making the correct answer B) 1.