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3.3 Transitions - Cause–effect transitions (therefore, thus)
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Before the 1847 introduction of the US postage stamp, the cost of postage was usually paid by the recipient of a letter rather than the sender, and recipients were not always able or willing to pay promptly. blank collecting this fee could be slow and arduous, and heaps of unpaid-for, undeliverable mail piled up in post offices.

Which choice completes the text with the most logical transition?

A.

Regardless,

B.

On the contrary,

C.

Consequently,

D.

For example,