b
Because, there is a force from the ground to the spaceship and force from the ground to the spaceship
Remember, Law of Interaction states that at every action force there is a reaction force. this can be stated in equation form
[tex] F_{xy}=-F_{yx}[/tex]
where,
[tex]F_{xy}[/tex] is a force from object x to object y
[tex] F_{yx} [/tex] is a force from object y to object x
