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The correct answer is C ,

S1: the point we use the carry look ahead adder is to do fast calculation. When carry are available at the same time. Calculation is done in the same cycle. and result is obtained after one cycle .

s2: the cost is higher as a there is a need of extra hardware for like, AND OR gates in  carrylookahead adder.
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Option A is correct since for carry look ahead adder carry present at start so no need to wait , but in ripple adder we wait for output at 1st half adder or full adder.

Edited:
Cost of carry look ahead adder is more b/c used two level and or gate ...(calculate Gi= Ai*Bi and Pi=  Ai exor Bi) then start normal functioning . 

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Both are correct because carry look ahead calculate faster without waiting for carry

But it uses complex hardware

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