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Rearrange the following to form a meaningful sentence:

(A) than any existing engines

(B) in theory, once all the bugs

(C) deliver better total fuel economy

(D) have been sorted out, fuel cells should

Choose the correct answer from the options given below:

Solution

✅ Correct Option: 4

B opens the sentence (in theory, once all the bugs), D completes the conditional clause (have been sorted out, fuel cells should), C supplies the main verb phrase (deliver better total fuel economy), and A closes the comparison (than any existing engines). The order is (B), (D), (C), (A).

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