Final answer:
The common factor for 11a and 22ab is both 11 and a, since both terms can be divided by 11 and both contain the variable a.
Therefore, the correct answer is A) 11 and B) a.
Step-by-step explanation:
The common factor for 11a and 22ab is a value that both terms can be divided by. To find this, we look for any numbers and variables that appear in both terms. The first term, 11a, consists of the number 11 and the variable a. The second term, 22ab, consists of the number 22 (which is 11 multiplied by 2), and the variables a and b. Since 11 is a factor of 22 and the variable a is present in both terms, the common factor can be identified as 11a.
Therefore, the correct answer is A) 11 and B) a.