For arrangement 1:
Total number of counters =56 counters
Number of counters in each row =8 counters
Let the number of rows be “t”.
Number of rows = Total number of counters ÷ Number of counters in each row
t=56÷8
t=7 rows
Arrangement 2 has the same number of rows as that in arrangement 1.
Total number of counters =63 counters
Number of row =7 rows
Let the number of counters in each row be “b”.
Number of counters in each row = Total number of counters ÷ Number of rows
=63÷7
=9 counters
9 counters are arranged in each row in arrangement 2.
Hence, option A is correct.