|Question 20Verbal

Source Texts

Text
Sociologist Alton Okinaka sits on the review board tasked with adding new sites to the Hawaii Register of Historic Places, which includes Grove Farm, established in 1864, and the Kauai Belt Road, a section of Route 560 along the north coast. Okinaka doesn't make such decisions single-handedly,______ historical designations must be approved by a group of nine other experts.
Which choice completes the text so that it conforms to the conventions of Standard English?
however and all
A
however. All
B
however all
C
however, all
D