Answer: 6
Explanation:
Given : Toby is making a picture graph.
Each picture of a books is equal to 2 books he has read.
i.e. 1 picture = 2 books he has read.
Also, the town for month 1 has 3 pictures of book.
Then, 3 pictures =

i.e. Number of books Toby read in month 1= 6
Hence, the correct answer is :Toby read 6 books during month 1.