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The moment he 'd decided to tell her the truth , she seemed to know it , and she placed her hands on his arm , holding his hand close to her .

What may be the reason he decided to tell the truth ?
Select from the following. (a). He knew she would catch him if he lied .. (b). None of the above choices .. (c). He knew lying would make matters better .. (d). He had never told a lie in his life before ..
(a).