Cho mặt phăng \( (\alpha) \) và đường thẳng \( d \not \subset(\alpha) \). Khẳng định nào sau đây là sa A. Nếu \( d / /(\alpha) \) thì trong \( (\alpha) \) tồn tại đường thẳng \( \Delta \) sao cho \( \Delta / / d \). B. Nếu \( d / /(\alpha) \) và \( b \subset(\alpha) \) thì \( b / / d \). C. Nếu \( d \cap(\alpha)=A \) và \( d^{\prime} \subset(\alpha) \) thì \( d \) và \( d^{\prime} \) hoặc cắt nhau hoặc chéo nha D. Nếu \( d / / c ; c \subset(\alpha) \) thì \( d / /(\alpha) \).

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Đáp án sai là **B**.

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