Final answer:
The greatest number of tens to put in each group when 105 is divided by 3 is 35 tens.
Step-by-step explanation:
In the problem, 105 is divided by 3. To find the greatest number of tens to put in each group, we need to divide 105 by 3, rounding down the quotient to the nearest whole number. The quotient is 35, which means there are 35 groups of 3 tens in 105. Therefore, the correct answer is D. 35 tens.