Given, each member of the group completed
foot of a tower for garden display.
There were 3 members in the group. We have to find total height of the tower.
To find total height of the tower we will multiply number of members with

So height of the tower =

=

=

Now to find the height we have to simplify
.
To simplify it we will divide the numerator and denominator by a common factor of them. Common factor of 15 and 12 is 3. If we divide both of them by 3 we will get,
.
We have got an improper fraction. We need to convert it to mixed fraction.

So we have got the required answer.
Option A is correct.