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According to kinetic theory of gases in an ideal gas between two successive collisions a gas molecule travels:

$\begin {array}{1,1}(a)\;In \;a\; straight\; line\; path\\(b)\;With\; an\; accelerated\; velocity\\(c)\;In \;a\; circular\; path\\(d)\;In\; a\; wavy \;path \end {array}$

It is one of the assumption of kinetic theory of gases.
Hence the gas molecule travels in a straight line path.