Inertia without gravity Is there inertia in absence of gravity? If I was in a region of space with zero gravity, would I have to apply some force to accelerate a massive body?
 A: 
Is there inertia in absence of gravity?

Inertia is just another word for mass.
So yes, there is mass in absence of gravity.

If I was in a region of space with zero gravity, would I have to apply some force to accelerate a massive body?

Yes, of course.
This it what Newton's second law says:
$$\vec{F}=m\vec{a}$$
You need a force to accelerate a mass.
This law is independent of gravity.
Gravity is just one possible cause of a force.
But there are many other possible causes for a force.
A: Inertia is a property of mass, and it exists in the absence of gravity and you would have to apply a force to accelerate a body even if the object is massive.
A: Every answer here is wrong. Inertia and gravity are NOT independent, they are two aspects of the same phenomena. You cannot have one without the other (or without mass, which again is another way of looking at the same phenomena).
In your hypothetical scenario, the massive body in question would necessarily have its own gravitational field so there couldn't be 'zero gravity'. If there were no gravitational field then the body could not have mass, in which case it couldn't be accelerated because it would always be traveling at $c$.
