Sentence Correction (SC) | Found only in the Western Hemisphere

HelloGMATNinja ,

I have a query regarding the absolute phrase at the end of option B.

(B) Found only in the Western Hemisphere, hummingbirds survive through extremes of climate, their range extending fromAlaska toTierra del Fuego , fromsealevel rain forests to theedges of Andean snowfields and ice fields at altitudes of 15,000 feet .

their range extending from X to Y, fromA to B of P and Q .

Since this is officially correct answer, I am guessing its grammatical to omit any connector between