Please help I really need it

I would've loved to help but someone already answered so I am also so they can be brainliest overall which in my opinion they helped out and it was nice stumbling uppon a friends question XD Nice seeing you again!!

1. is A??

2. is C??

3. is D??

4. is A??

I am making an educated guess saying as we cannot see the story. I have tried and hope this educated you and is 100% correct if not I sincerely apologize for making a great friend fail. ;w;

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.