Biologists have observed among groups of chimpanzees differences so marked as to represent cultural variations: the members of one clan, for instance, crack the shell of a certain kind of nut
by selecting a flat stone to use as an anvil and then selecting another more pointed one to use as a hammer to strike the nutshell sufficiently hard to break it and not to squash the nut within.
A) by selecting a flat stone to use as an anvil and then selecting another more pointed one to use as a hammer to strike the nutshell sufficiently hard to break it and not to squash
B) by selecting a flat stone to use as an anvil and a more pointed one to use as a hammer and then striking the nutshell sufficiently hard to break it, but without squashing
C) through the selection of a flat stone to use as an anvil and of another, more pointed, to use as a hammer and through blows to the nutshell sufficiently hard to break it but not to squash
D) through selecting a flat stone to use as an anvil and another one. more pointed, to use as a hammer and through giving blows sufficiently hard to break the nutshell, and not squashing
E) by selecting a flat stone to be used as an anvil and a more pointed one to be used as a hammer and by striking the nutshell sufficiently hard to break it, but without squashing
Clearly, the best candidates are options B and E. Could you please describe what are your reasons for choosing or discarding each of these two options?