Without adequate amounts of sleep, people's newly acquired skills and also new factual information may not get properly encoded into their memory circuits.

(A) Without adequate amounts of sleep, people's newly acquired skills and also

(B) Without the adequate amount of sleep they need, people's newly acquired skills and even

(C) If they do not have adequate amounts of sleep, people's newly acquired skills and even

(D) If people do not get adequate amounts of sleep, newly acquired skills and even

(E) If people do not get the adequate amount of sleep they need, newly acquired skills and also