关于一道让楼主纠结的语法题!

St. John's Newfoundland， lies on the same latitude as Paris， France， but in Spring St. John's residents are less likely to be sitting at outdoor cafes than to be bracing themselves against arctic chills， shoveling snow， or seeking shelter from a raging northeast storm.

　　(A) residents are less likely to be sitting at outdoor cages than to be bracing themselves against arctic chills， shoveling snow， or seeking

　　(B) residents are less likely to sit at outdoor cafes， and more to brace themselves against arctic chills， shovel now， or be seeking

　　(C) residents are less likely to be sitting at outdoor cafes， and more likely to be bracing themselves against arctic chills， shoveling snow， or to be seeking

　　(D) residents， instead of their sitting at outdoor cafes， they are more likely to brace themselves against arctic chills， shovel snow， or seek

　　(E) residents， instead of sitting at outdoor cafes， are more likely to brace themselves against arctic chills， shovel snow， or to be seeking

正确答案选A，A中的seeking应该是和前面的bracing并列的吗？如果并列，那么arctic chills， shoveling snow之间为什么没有and连接？不是列举完毕一定要有and连接最后一个列举项吗？求大神解释