请问：OG11 诊断性测试中的语法题

OG11第95页第39题
            

According to scholars, the earliest writing was probably not a direct rendering of speech, but was more likely to begin as a separate and distinct symbolic system of communication, and only later merged with spoken language.

A: was more likely to begin as

B: more than likely began as

C: more than likely beginning from

D: it was more than likely begun from

E: it was more likely that it began

对于more than likely得用法，看完OG的解释仍然不太明白

请教NN