The blank requires a verb to denote the action done by the mountaineers with respect to the activity of 'trekking'. 'Pausing' (temporarily interrupt the operation), 'holding' (keep or sustain in a specified position), 'glazing' (enclose or cover with glass) and 'firing' (discharge a gun or other weapon in order to propel (a bullet or projectile)) are contextually irrelevant words to the given sentence and thus negated. Option (d) 'getting' (move or come into a specified position, situation, or state) is the most appropriate word that can fill the given blank as required and also matches with the context of the sentence.
Hence, the correct answer is option (d).
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