Convert each percentage straight to grams for the $200$ g portion: fat $= 0.05 \times 200 = 10$ g, protein $= 0.25 \times 200 = 50$ g, carbohydrate $= 0.68 \times 200 = 136$ g. Multiply each by its calorie factor, $9$ for fat and $4$ for both protein and carbohydrate: $10 \times 9 = 90$, $50 \times 4 = 200$, $136 \times 4 = 544$. Adding these three energy contributions, $90 + 200 + 544 = 834$ Cal. The other options come from using a wrong fat factor or misreading a percentage, so they do not survive this direct check. \[\boxed{834 \text{ Cal}}\]