The correct answer is: B. reaches
The verb “reach” is used to describe the act of arriving at a destination. In this case, the sentence is about a woman who arrives at her office by 9 a.m. daily. The simple present tense is used to describe habitual actions, which are actions that happen regularly or repeatedly. In this case, the woman reaches her office by 9 a.m. every day.
The other options are incorrect because they do not agree with the tense of the sentence. The verb “reached” is in the past tense, but the sentence is about a habitual action. The verb “reaching” is in the present participle, but the sentence is not about an action that is happening right now. The verb “to reach” is the infinitive form of the verb, but the sentence is not about an action that is possible or necessary.
In conclusion, the correct answer is: B. reaches