She is able to give an objective account of one part of Enrique's life.
The writing of Enrique's emotional journey in the form of a biography would help Sonia to 'be able to offer an objective account of one part of Enrique's life' as the readers would themselves be able to relate to his experiences and sympathize with him.
If she had not opted for a biographical portrayal of his journey, she could have been considered biased and the audience could not relate to him that impactfully and the intended response might not come out. Thus, opting for a biographical form allows her to offer an unbiased account of his journey and elicit natural responses and feelings from the audience.
Thus, his could be the answer.
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