Correct option is A
Option (a) is the correct order of the given sentences.
·
P directly explains
how a compass works (points to magnetic north) → natural first detail after the topic sentence.
·
Q adds a situational advantage (works in cloudy weather), continuing the line of
reliability.
·
R strengthens reliability by stressing
independence from GPS/electricity—a key contrast with modern devices.
·
S brings in
users (hikers and sailors), showing practical reliance.
· With these supports, the conclusion “
Thus, it remains a reliable tool even today” (6) follows logically from reliability claims in P, Q, R and user trust in S.