In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each blank.
Forest five always (1)………… by one of two reasons - naturally caused or human caused. Natural fire is generally (2)........by lightning. WIth a very small percentage (3)........ by spontaneous combustion of dry fuel as sawdust and leaves. (4)........... human caused fire can happen (5)......... any number of reasons.
Select the most appropriate option for blank No.3

Options

A. achieved
B. gathered
C. contributed
D. attained

Answer

C