Examentrainers

Gebruik bijlage "Girls trounce the boys in examination league table"
'the superiority of their attainments over those of boys in single-sex schools is less easily explained' (lines 77-80).
In which lines does the writer suggest his own explanations?

1. Lines 80-84 ('Boys ... girls.')
2. Lines 87-95 ('Some ... protectiveness.')
3. Lines 96-98 ('Heads ... teenagers.')
4. Lines 100-104 ('What ... boys.')
5. Lines 112-117 ('A more ... themselves.')

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