The correct option is C Both B and C are correct.
According to the given tally chart,
Number of long screws =7
Number of medium screws =10
Number of short screws =7
As per Option A, there should be 5 medium screws, which is not true.
As per Option B, the number of long screws is equal to the number of short screws, which is true as per the tally chart because both long and short screws equal 7.
As per Option C, the number of medium screws = short screws + 3
=7+3
=10
This is also true as per the tally chart.
Hence, we can conclude that both options B and C are correct.
Hence, Option D is correct.