You do 30 times 10 which equals 300 seeds planted
So you got the answer already
You would just do 4 x 7, which means there are 28 combinations.
The answer to this is A and D. A and D are both rational because they contain repeating numbers.
B) could've been the answer but it doesn't show any repeating numbers
C) Doesn't have a repeating number.
So A and D are the answers. (if there is only one option for this answer then D should be the answer)
Hoped this helped :)
Have a great day