Unlike amateur clammers, who usually dig clams by hand during the summer, professional clammers
work year-round, using all-weather instruments such as the hydraulic dredge or a 20-foot-long implement known as a bull rakeFirst split: work VS working. "
Work" is a verb, "
working" is a modifier. Consider C and D:
C.
working year-round and
using all-weather instruments such as a hydraulic dredge or a 20-foot-long implement known as a bull rake
This sentence has no verb. Cannot be right
D.
working year-round use all-weather instruments like hydraulic dredges or 20-foot-long implements known as a bull rake
This sentence has a structure issue. The overall sentence is not clear : "Unlike amateur clammers, who usually dig during the summer professional clammers use all-weather instruments ". Moreover "like" should be replaced by "such as", as we want to give examples
We are left with A B and E:
A. work year-round,
using all-weather instruments such as the hydraulic dredge or a 20-foot-long implement known as a bull rake
B. work year-round by
using all-weather instruments like hydraulic dredge or 20-foot-long implements known as a bull rake
E. work year-round
using all-weather instruments, for example, a hydraulic dredge or 20-foot-long implements known as a bull rake
All those use work correctly. But they differ in the usage of "
using". What is the sentence trying to express?
The structure should be "they work,
HOW they work", the construct
COMMA + ING expresses this idea correctly.
In E "
using" is used without the comma and modifes the preceding noun, does not express how they work.
BTW, there are also other reasons to pick A over B and E (
implement VS
implements for example or
such as VS
like)