A constant force applied to object A causes it to accelerate at 5 m/s2 .The same force applied to object B causes an acceleration of 3 m/s2

I have just started to learn Physics just a month ago and my concepts may be wrong. I apologize for this first.

Part A.

B because force = mass x acceleration so the mass is bigger than others so the accelaration should be smaller.

Part B.

C, same reason.

Part C.

Because the force remains the same, we have:

\(\text{Force} = 5 \times \text{Mass}_{\text{A}}\\ \text{and}\\ \text{Force} = 3 \times \text{Mass}_{\text{B}}\)

So that we have:
\(5\times \text{Mass}_{\text{A}} = 3 \times \text{Mass}_{\text{B}}\\ \dfrac{\text{Mass}_{\text{A}}}{\text{Mass}_{\text{B}}}=\dfrac{3}{5}\\ \text{Mass}_{\text{A}} : \text{Mass}_{\text{B}}= 3:5\)

I have got that question by my one-month learning knowledge :)