The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic people has been established by carbon-14 dating, but what is much more difficult to determine are the reason for their decoration, the use to which primitive people put the caves, and the meaning of the magnificently depicted animals.
(A) has been established by carbon-14 dating, but what is much more difficult to determine are
(B) has been established by carbon-14 dating, but what is much more difficult to determine is
(C) have been established by carbon-14 dating, but what is much more difficult to determine is
(D) have been established by carbon-14 dating, but what is much more difficult to determine are
(E) are established by carbon-14 dating, but that which is much more difficult to determine is
[spoiler]I narrowed it down to A and B. The OA is B, but I am confused as to why A is not the answer. Answer (a) has a list of three following it ( difficult to determine are X,Y, and Z) ... Shouldnt are be used here ??
I am reallly confused with this one[/spoiler]
(A) has been established by carbon-14 dating, but what is much more difficult to determine are
(B) has been established by carbon-14 dating, but what is much more difficult to determine is
(C) have been established by carbon-14 dating, but what is much more difficult to determine is
(D) have been established by carbon-14 dating, but what is much more difficult to determine are
(E) are established by carbon-14 dating, but that which is much more difficult to determine is
[spoiler]I narrowed it down to A and B. The OA is B, but I am confused as to why A is not the answer. Answer (a) has a list of three following it ( difficult to determine are X,Y, and Z) ... Shouldnt are be used here ??
I am reallly confused with this one[/spoiler]
