Read the statement and answer the question. 'Some of the lecturers who marked the scripts are external examiners. All external examiners are paid in foreign currency.' Which of the following must be true?

Some markers are external examiners, and every external examiner is paid in foreign currency, so at least those markers are paid in foreign currency. The statements say nothing about how the other markers are paid or how many markers are external, so the claims about all, none and most go beyond the evidence.