If P : a foreigner wishes to Q : learn standard English R : learn English S : he will, of course, The Proper sequence should be:

The correct answer is: B. PRQS

The sentence is: If a foreigner wishes to learn standard English, he will, of course, learn English.

The logical sequence of the sentence is:

1. A foreigner wishes to learn standard English.
2. He will, of course, learn English.

Therefore, the correct sequence of the sentence is: PRQS.

Option A, PQSR, is incorrect because it puts the second clause before the first clause. This does not make sense, because the second clause cannot happen before the first clause.

Option C, PRSQ, is incorrect because it puts the third clause before the second clause. This does not make sense, because the third clause cannot happen before the second clause.

Option D, SRQP, is incorrect because it puts the third clause before the first clause and the second clause. This does not make sense, because the third clause cannot happen before the first clause or the second clause.