36. A first-grade teacher has guided students to represent three numbers using bas-ten blocks. The students compare the numbers created and reason about the relationships between them. Which of the following New York State P-12 Common Core Learning Standards for Mathematics is the teacher developing with the students? | A) Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count B) Add within 100, including adding a two digit number and multiple of 10 C) Understanding that in adding two-digit, sometimes it is necessary to compose a ten D) Use place value understanding to round whole numbers to the nearest 10