The way you wrote the question is unable to understand
First you need to convert then to the same units. So 3yd 1ft would be equal to 10 ft. Then you need to convert the feet to inches. 10ft x 12 is equal to 120 inches.
120 inches is greater that 100 inches.
I believe that it is letter D 11.4inchrs
The answer is simple. 6 x 6 = 36.
One flower bed will have side lengths 3,8,3,8 and the other will have 4,6,4,6. Hope I helped!