no clue how to solve this question

lily88888UID: 2828533

At night, a flock of crows will generally perch close

together in a small place--often a piece of wooded

land--called a roost. Each morning, the crows leave the

roost and fan out in small groups to hunt and scavenge

the surrounding area. For most flocks, the crows'

hunting extends as far as 100 to 130 kilometers (60 to

80 miles) from the roost. Normally, a flock will continue

to occupy the same roost for several consecutive years,

and when it abandons a roost site for a new one, the new

roost is usually less than eight kilometers (five miles)

away.

Of the following claims, which one can most justifiably

be rejected on the basis of the statements above?

(A) Crows will abandon their roost site only in

response to increases in the population of the

flock.

(B) When there is a shortage of food in the area in

which a flock of crows normally hunts and

'

scavenges, some members of the flock will

begin to hunt and scavenge outside that area.

(C) Most of the hunting and scavenging that crows do

occurs more than eight kilometers (five miles)

from their roost.

(D) Once a tlock of crows has settled on a new roost

site, it is extremely difficult to force it to

abandon that site for another.

(E) When a tlock of crows moves to a new roost site,

it generally does so because the area in which it

has hunted and scavenged has been depleted of

food sources.

bonsmotsUID: 2631865

E. Because what E suggests is directly in contrary to what the stem says.  

E: the reason for moving to a new roost site it the depletion of food resources

Stem: The new roost is usually only 8km away from the old, and as they only hunt in surrounding areas, the depletion of food resources argument in E is directly in contradictory to the stem.

duijinxiaoziUID: 2585955

five miles 《     60 to 80 miles