Answer:
d. it enabled sailors to calculate local time.
Explanation:
Chronometer is an accurate timepiece invented by John Harrison in the 18th century (1761). It is usually taken along by sailors during traveling or voyages.
The main function of the Chronometer is to deduce the actual longitude and at the same time measure the time of the known location regardless of the weather conditions or the motion.
Hence, in this case, the correct answer is "it enabled sailors to calculate local time."
