Final answer:
The author should add 'According to Hermino Rabanal' at the beginning of the sentence to attribute information according to MLA format.
Step-by-step explanation:
By MLA format, if the author wants to add an attributive phrase at the beginning of the sentence, the most suitable option would be: According to Hermino Rabanal, as it attributes the information to the author and sets up a signal phrase that precedes the quotation or paraphrasing of Rabanal's work. MLA style emphasizes brief and clear signal phrases that introduce the source or author of the information being discussed, making this choice appropriate for integrating the source directly into the text.