The correct sentence will be "I have to hand in my paper to Dr. Soriano by late morning on Tuesday".
- It should be noted that the use of a.m and p.m is more applicable to a number attached. For example, this is better used in cases such as 7a.m, 2a.m etc.
- On the other hand, in this case, a number isn't attached. Therefore, I have to hand in my paper to Dr. Soriano by late morning on Tuesday" is better.
In conclusion, the correct option is A.
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