CMFAS M9 Insurance Contract & Law of Agency question: rely on the defence of non est factum

A signatory may rely on the defence of non est factum only if:

• A He signed without reading it, although nothing prevented him from checking what it was
• B The document was fundamentally different from what he intended, and his mistake was not due to carelessness
• C The terms turn out less favourable than he expected, though the document is the kind he meant to sign
• D He can prove the other party committed fraud, whatever the document's actual contents