The sentence starts with a question. The answer to this question can easily be spotted in Q. Next sentence that will come is P which further adds to the answer to the earlier question. R is the further extension to the phrase ‘broadens the mind’ as mentioned in P. S comes at the end of it for it contradicts the reasons given earlier to make frequent trips. S6 concludes the statement. QPRS is the correct sequence. Hence, (d) is the correct option.