Which answer provides the correct name for the following hydrocarbon?

moving left to right: a hydrocarbon chain made of a methyl group (ch subscript three) single bond methylene (ch subscript two) single bond methylene (ch subscript two) single bond ch subscript two single bond methyl group (ch subscript three) .

it looks like: ch3 - ch2 - ch2 - ch2 - ch3

pentene
pentane
2-pentane
pentyne