Answer:
B. I spend about half my time, he spends two-thirds of his time, and she spends a quarter, or maybe a third, of her time on research.
Step-by-step explanation:
I spend about half my time, he spends two-thirds of his time, and she spends a quarter, or maybe a third, of her time on research.
You need hyphens between words denoting fractions.
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