We were told that the number packages of pencils were 7 fewer than packages of pens
This means that the number of packages of pencils is p - 7
Given that Pencils cost $5.55 per package, the cost of p - 7 pencils would be
5.55(p - 7)
Given that pens cost $6 per package, the cost of p pens would be
p * 6 = 6p
Therefore, the expression, 6p + 5.55(p - 7) represents
Total cost of pens and pencil
The correct option is C