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What is the best way to rewrite this sentences as a compound sentence?

Curiosity's landing on Mars required tremendous effort. The six-wheeled rover weighs nearly one ton.

A. Curiosity's landing on Mars required tremendous effort; and the six-wheeled rover weighs nearly one ton.
B. Curiosity's landing on Mars required tremendous effort, for the six-wheeled rover weighs nearly one ton.
C. Curiosity's landing on Mars required tremendous effort; nor the six-wheeled rover weighs nearly one ton.
D. Curiosity's landing on Mars required tremendous effort, yet the six-wheeled rover weighs nearly one ton.