Topic: Group verb,

Best Answer Explained in Below-:

The sentence "The candles have been blown _____ by the wind" requires a preposition that accurately conveys the effect of the wind on the candles. The correct choice is "out," which indicates that the flames of the candles have been extinguished due to the wind's force.

When we say "blown out," it implies that the candles were lit and the wind caused their flames to go extinguished, as if they were forcefully snuffed out. This phrase is commonly used in English to describe the action of wind or another force snuffing out a flame, making it the most logical choice.

On the other hand, "blown away" would suggest that the candles themselves might be moved from their position, rather than specifically describing the extinguishing of their flames. "Blown up" usually refers to something being exploded or intensified, which doesn't apply in this context. Therefore, "out" clearly communicates the intended action: the wind extinguishing the flame, making it the best fit for the sentence.