Keeps them warm so they do not freeze in the cold !
B. A possessive noun should have its instead of it's (which is a contraction for it is).
For A. Diana is a singular noun and the apostrophe should come after the r instead of after the s.
For C. The duck would've dunked ITS instead of IT'S beak since it is possessive.
For D. You do not need to put an apostrophe since theirs is already a possessive noun.
Answer is A. Injury is just one risk that mountain climbers face.
It is chilling, the speculation and wonder about what was really happening is finally realized. Mrs. Schachter had disturbed the train care with what appeared to be ravings from a lunatic about a hellish scenario to come. And finally here it was, the unknown reality, becoming a known and nightmarish hell.
The answer is B. Because, if the students had the flu, of course their absence was 'legitimate', which means 'acceptable', allowed. And 'aberration' means 'something unusual or unexpected", because they usually have perfect attendance, but now they missed a couple of classes.