The most likely conditions under which ripple marks form are:
a) Hot and dry with little rain and lots of evaporation (desert)
b) Beach or tidal flat with shallow water flowing over the sand
c) Deep ocean
d) Swampy and boggy environment under tropical or temperate climate
e) Some environment where mud can periodically get wet and dries out again
Ans: b) Beach or tidal flat with shallow water flowing over the sand
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