She . . . . . . . . onto the train because the station guard . . . . . . . . his whistle.

The correct answer is C. hurried/was blowing.

The sentence is in the past tense, so we need to use a verb in the past tense. The only option that is in the past tense is C. hurried/was blowing.

The other options are not in the past tense. A. has hurried is in the present perfect tense. B. hurries is in the present tense. D. was hurrying is in the past progressive tense. E. is hurrying is in the present progressive tense.

The

sentence also tells us that the station guard was blowing his whistle. This means that the train was about to leave, so the woman had to hurry to get on the train. The only option that makes sense with this information is C. hurried/was blowing.

Here is a diagram that shows the tenses of the verbs in the sentence:

Tense | Verb | Explanation
——- | ——– | ——–
Past | hurried | The woman hurried to get on the train.
Past | was blowing | The station guard was blowing his whistle.

I hope this explanation is helpful. Please let me know if you have any other questions.