[求助]TT GWD-6-11

Q11:

In 1992 outlaw fishing boats began
illegally harvesting lobsters from the territorial waters of the country of
Belukia.  Soon after, the annual tonnage
of lobster legally harvested in Belukian waters began declining; in 1996,
despite there being no reduction in the level of legal lobster fishing
activity, the local catch was 9,000 tons below pre-1992 levels.  It is therefore highly likely that the
outlaw fishing boats harvested about 9,000 tons of lobster illegally that year.

Which of the following is an assumption on
which the argument depends?

1. The illegal lobster harvesting was not so extensive that the
        population of catchable lobsters in Belukia’s territorial waters had
        sharply declined by 1996.
2. The average annual lobster catch, in tons, of an outlaw fishing
        boat has increased steadily since 1992.
3. Outlaw fishing boats do not, as a group, harvest more lobsters
        than do licensed lobster-fishing boats.
4. The annual legal lobster harvest in Belukia in 1996 was not
        significantly less than 9,000 tons.
5. A significant proportion of Belukia’s operators of licensed lobster-fishing
        boats went out of business between 1992 and 1996.