Answer:
a. read, question, summarize, practice
Step-by-step explanation:
The best way to read your math textbook most efficiently is to read, question, summarize, and practice.
Math has to do with counting, calculation, solving problems, making use of formulas, etcetera. You don't read a Math textbook the same way you read an English textbook because they are very different.
So, the first step is to read the textbook, then ask some questions, which can be interpreted as solving problems, summarize what you have learned so far and then go ahead to practice what you have learned.