Final answer:
The students in the Math Club are counting by 26, as 910 divided by 35 equals 26. Hence, the correct answer is A. 26.
Step-by-step explanation:
To determine the number that the students in the Math Club are counting by, we need to divide the last number mentioned, which is 910, by the total number of students, which is 35. This calculation will give us the number they are counting by.
Step 1: Divide 910 by 35.
910 ÷ 35 = 26
Therefore, the students are counting by 26. The correct answer is A. 26.