Answer:
A. You combine them to form a new and bigger idea.
Step-by-step explanation:
To synthesize in general means to combine some things with others to create something new. When you synthesize ideas, you are generally doing the same thing, creating something larger and more complex.
Example:
-Dogs are cute
-Cats are fun to be around
-Snakes are scary, but interesting
I am going to take these three ideas and mash them into one big, complex idea.
"Pets and other animals can be cute and fun to be around, but they can also be scary and intriguingly interesting."
See? I took the three ideas above and smashed them to be one big idea.
I hope this helps!
-No one