1. C
2. B,C,E
Hope that helps.
Solution:
we have given the length of the rectangular card-

and, width-

now, the area of the card will be- length×width.
so, we have-

we also have given the length of ribbon-

and, width-

so, area of the ribbon is-
length×width

now the area of shaded gray region will be-

Hence, the required expression would the above expression.
Answer:
I DID THIS FOR POINTS
Step-by-step explanation:
Longest side must be smaller than the sum of other two smaller sides, so
only 2nd option fits best
In short, Your Answer would be Option B
Hope this helps!