After death, the first insects to arrive are

a) blowfly maggots
b) blowfly larvae
c) blowfly pupae
d) blowfly adults looking for a place to lay their eggs

D) blowfly adults looking for a place to lay their eggs

Explanation:

The first insects that reach the corpse or dead body are flies called blowflies or Calliphoridae. They get attracted to the dead body soonest after death and lay their eggs in either the orifices or any wounds present on the corpse.

The mature blow flies reach at the dead body and lay their eggs few minutes after death occurs. This is because the odour of corpse attracts them. The eggs then develop into larvae or maggots. These maggots then feed on the dead parts and get mature into an adult blow fly.

The study of these insect on the dead bodies is of huge importance in forensic studies since they provide information about accurate date of death, food history or drug history of dead and estimation of post martem interval etc.

Hope it help!