3. A Emma plays often tennis on Fridays. B Emma often plays tennis on Fridays.

Решение:

В предложении 'Emma plays often tennis on Fridays.' наречие 'often' стоит не на своем месте. Оно должно стоять перед основным глаголом 'plays'.

Правильный вариант: 'Emma plays often tennis on Fridays.' (Исправление: 'Emma often plays tennis on Fridays.')

Ответ: B.