The magnetic flux $\varphi$ linked with a circuit of area $A$ in a magnetic induction field $B$ is given by 

$\varphi =BA \cos \theta$

Where $\theta$ is the angle between the field and area vectors.

$\therefore$Dimensions of $\varphi =$dimensions of $BA (\because \cos \theta$ is dimensionless)

$$\begin{gathered} =M{L}^0{T}^{-2}{A}^{-1}\times L^2 \\ =M{L}^2{T}^{-2}{A}^{-1} \end{gathered}$$

Thus, the correct choice is 1