Given set of scores= 46, 54, 62, 68, 56, 29, 58

We know the formula,

 $\mathrm{Average} \left(\mathrm{A}\right)=\frac{\mathrm{Sum} \mathrm{of} \mathrm{given} \mathrm{values} \left(\mathrm{S}\right)}{\mathrm{Total} \mathrm{number} \mathrm{of} \mathrm{values} \left(\mathrm{N}\right)}$

 Here,

 Sum of given values(S)

= 46+54+62+68+56+29+58

= 373

Total number of values(N)= 

Substituting these values we get (A),

 $= \frac{373}{7}=53.28$

Hence, Option A is correct.