Which transition would work best between these sentences?

canals and railroads lessened the cost of moving goods. prices fell on goods from across the country due to lower shipping costs.

however

undeniably

as a result

for example

The answer is: As a result.

“As a result” is an expression often used as a conjunctive adverbial phrase which implies a causal relationship —a relationship of cause and effect— between two clauses. The expression is a synonym of “therefore”, “consequently”, “as a consequence” “accordingly”, and “hence”. In order to be properly used, it should be preceded by a semicolon, like this:

Canals and railroads lessened the cost of moving goods; as a result, prices fell on goods from across the country due to lower shipping costs.

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