I think it’s D: depends only on their masses
Charge quantization is the principle that the charge of any object is an integer multiple of the elementary charge. Thus, an object's charge can be exactly 0 e, or exactly 1 e, −1 e, 2 e, etc., but not, say, 12 e, or −3.8 e, etc.
M=1000kg
a=2 m/s²
Thrust force= 5000N
a =F/m
2m/s² =(5000N-Drag force)/1000kg
1000×2 =5000-Drag force
2000b =5000-Drag force
Drag force= 5000-2000
Drag force= 3000N
10m/s - 3m/s = 7m/s
The resultant velocity is 7m/s