The answer is E, acre. The other options are all units of length, while acre is a unit of area.
A metre is a unit of length in the International System of Units (SI). It is defined as the distance that light travels in a vacuum in 1/299,792,458 of a second.
A furlong is a unit of length equal to 1/8 of a mile, or 201.168 metres. It is used in horse racing and other sports.
A yard is a unit of length equal to 0.9144 metres. It is used in the imperial and US customary systems of measurement.
A mile is a unit of length equal to 1.609344 kilometres. It is used in the imperial and US customary systems of measurement.
An acre is a unit of area equal to 4,840 square yards or 43,560 square feet. It is used in the imperial and US customary systems of measurement.