That man is aggressive by nature is a hard fact of life and no one can deny it.

A

That man is aggressive by nature is a hardfactoflife which none can deny.

B

That man is aggressive by nature is a hardfactof life and no one can denyit

C

That man is aggressive by nature is a hard factoflife and not one can deny

D

That manis aggressive by nature is hard for anyoneto deny.