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I think there might be a mix up here regarding Option C. Controlling for age and weight actually increases the internal validity of the study by eliminating potential confounding variables, which strengthens a causal argument rather than weakening it.
The explanation seems to be confusing internal validity with generalization (external validity). While C doesn't weaken the argument, E is still the better answer because completely ruling out reverse causality is a much more powerful logical strengthener on the LSAT than just controlling a couple of background variables.