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Keeping thepressure constantand increasing the temperature will increase thespeedof the particles. Therefore, the correct option is D.According to theideal gas equation(PV = nRT), the speed of the gas particles is precisely related to the square root of the temperature. Therefore, if thetemperatureis increased while the pressure remains the same, the speed of thegas particleswill increase. This is because the particles move faster when theirkinetic energyis higher due to higher temperature. The other options mentioned will not accelerate the particles immediately.Therefore, the correct option is D.Learn more aboutspeedhere:brainly.com/question/22610586#SPJ3...