Physics question acceleration

Imagine you've got this rocket-powered truck on horizontal tracks, right? It's cruising along, and the force pushing it is a steady buddy—doesn't waver. Air resistance? Nah, that's like a gentle breeze to this truck. Now, here's the kicker: the truck's mass is basically the same as the fuel it's guzzling.
[start]So, they light up the fuel, and it's all systems go. The force pushing it is rock-solid, but here's the twist. As the truck burns through fuel, it's shedding weight. And you know what happens when the weight drops? Acceleration cranks up.[/start]
[start]It's like your friend giving you a push on a skateboard. You start with a backpack full of books (that's your initial mass), and your friend's push (the force) gets you rolling. Now, picture ditching some books along the way. Your friend's push is the same, but you're lighter, so you start zooming faster. That's what's happening with the truck. The force stays chill, but as it burns fuel and sheds weight, it's picking up speed.[/start]
[start]So, the deal is, as the fuel disappears, the truck's acceleration steps on the gas. That's why the answer is B[/start]

So would the horizontal force not matter then, the acceleration will depend on the weight?

Its just newton 2 so
f = ma
force is constant so acceleration is inversely proportional to mass, so
acceleration = force/mass
As mass (x) decreses, acceleration (y) increases like
https://www.desmos.com/calculator/t4eynssasg

Ohhh ok i was getting confused with the force but I get it now, thank you!!

Its just newton 2nd law so
F = ma …