Needing help with an explanation for this question, thank you in advance.

1. ii)On November 9th 2020, Pfizer announced interim results for a Phase 3 study on the COVID-19 vaccineBNT162b2. Their study enrolled 43,538 subjects divided into a control arm and a study arm. Their interim results indicated 90% vaccine efficacy after 94 infection events among the study subjects. What statistical tool would be most ap- propriate for assessing the significance of this result?

A) An unpaired two-samplet-test.

B) Pearson's correlation.

C) A log-rank test.

D) AnF-test.

E) Fisher's exact test.

F) Kaplan-Meier curves.

(5 points)