Answer: the last statement.
Step-by-step explanation:
From the body of the passage in the question above , wooden area was not mentioned in the question , since it was not mentioned, it eliminates every option that states wooden area I.e 1 and 3 statement is wrong.
To add, from the passage, it is not possible for the clovers
to be on the body clothes since there was no clover grown in pine forest and grass this also eliminate the second statement, because its only through the river bank that both the clovers and grass will the body cine in contact with them not in the pine forest.
The best conclusion to the passage is the last option , as it is possible for the body to float along the grassy river bank before coming to the pine forest.