Shalabh09 wrote:
Based on accelerator mass spectrometry, an advanced technique that makes it possible to obtain radiocarbon dates from samples much smaller than that necessary for traditional radiocarbon dating, scholars have been able to determine impressively precise radiocarbon ages for samples of Glyptodon and Holmesina recovered from the La Brea Tar Pits, extinct large mammals similar to armadillos.
a very long sentence.
we need to understand the meaning of it first.
There is this accelerator mass spectometry - an advance technique
this technique makes possible to obtain radio carbon dates from samples much smaller than samples necessary for traditional radiocarbon dating
Using this technique, scholars have been able to determine impressively precise radiocarbon ages for samples of G and H
G and H - are extinct large mammals similar to armadillos.
these samples were recovered from La Brea Tar Pits.
Errors in original sentence:
based on - incorrect, better would be using, because the scholars by using this technique, got the results!
much smaller than that - that refers to samples. samples is in plural, but the relative pronoun is in singular
modifier error - extinct large mammals modifies La Brea Tar Pits, but this is a location!
A.
Based on accelerator mass spectrometry, an advanced technique that makes it possible to obtain radiocarbon dates from samples much smaller than
that necessary for traditional radiocarbon dating, scholars have been able to determine impressively precise radiocarbon ages for samples of Glyptodon and Holmesina recovered from the La Brea Tar Pits,
extinct large mammals similar to armadillos.
B.
Based on accelerator mass spectrometry, an advanced technique that makes it possible to obtain radiocarbon dates from samples much smaller than
necessary for traditional radiocarbon dating, scholars have been able to determine impressively precise radiocarbon ages for samples of Glyptodon and Holmesina, extinct large mammals similar to armadillos, recovered from the La Brea Tar Pits.
possible to obtain... from samples much smaller than "necessary" what???
C.
Using accelerator mass spectrometry, an advanced technique that makes it possible to obtain radiocarbon dates from samples much smaller than
those necessary for traditional radiocarbon dating, scholars have been able to determine impressively precise radiocarbon ages for samples of Glyptodon and Holmesina,
extinct large mammals similar to armadillos, recovered from the La Brea Tar Pits.
D.
Basing them on accelerator mass spectrometry,
which allowed them to obtain radiocarbon dates from samples much smaller than those necessary for traditional radiocarbon dating, scholars have been able to determine impressively precise radiocarbon ages for samples of Glyptodon and Holmesina, extinct large mammals similar to armadillos, recovered from the La Brea Tar Pits.
basing them - them??
which now modifies only spectrometry
E.
The use of accelerator mass spectrometry, an advanced technique that makes it possible to obtain radiocarbon dates from samples much smaller than those necessary for traditional radiocarbon dating,
have enabled scholars to determine impressively precise radiocarbon ages for samples of Glyptodon and Holmesina recovered from the La Brea Tar Pits,
extinct large mammals similar to armadillos.
1st - SV agreement error - the use HAVE - incorrect
2nd - this choice changes the meaning