(29)        

A The field of knowledge is so narrow and life is so long that the most avid reader can expect to absorb it all.

B The field of knowledge is so extensive and life is so brief that even the most avid reader can never expect to absorb it all.

C The field of knowledge is so much  and life is also long  so that the most avid reader can never expect to absorb it all.

D The field of knowledge is so large  and life is so brief that even the most avid reader can expect to absorb it all.