Young basketball players in the National Basketball Association lack

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Young basketball players in the National Basketball Association lack big-game experience to such a large extent as to make it difficult to feature them in a professional league becoming ever more dependent on tournament play.
a) lack big-game experience to such a large extent as to make it difficult to feature them in a professional league becoming. "lack ..to such a ..as to make it difficult" is there is a direct comparison whenver we to such a ... as to. However the sentence changed the entire content. the focus shift from Young basketball players to difficulty in featuring them
b) lack big-game experience to a large enough extent that they will be difficult to feature in a professional's league becoming. lack that they will be difficult is again incorrect also sentence after becoming makes no sense
c) lack of big-game experience is so large as to be difficult to feature them in the professional league that becomes lack of big -game is so large makes no sense
d) are lacking so much in big-game experience as to be difficult to feature into a professional league becoming are lacking so much in big-game experience as to be difficult , you need a correct modifier here lacking big game experience as to be difficult is incorrect
e) are so lacking in big-game experience that it will be difficult to feature them in a professional league becoming . this is the only sentence where "that"correctly modifies "lacking in big-game experience" and hence explain the result of it