The gas having the weakest London (dispersion) forces is the a nonpolar gas that has a low relative molecular mass.
The London dispersion forces occur in all substances. However, they are the dominant interaction non-polar substances.
Since the gases were not indicated in the question, I wish to explain to you that generally, gases having a low relative molecular mass and are non-polar will have the least london (dispersion) forces under the same conditions of temperature and pressure.
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