ANSWER
[tex]B)4\frac{1}{8}\text{ cups}[/tex]EXPLANATION
We have that two ingredients are mixed to make a sauce.
The sauce contains 1/2 cup of chopped onions and 3 5/8 cups of crushed tomatoes.
To find the total number of cups of ingredients the sauce contains, we have to add the two fractions of ingredients.
That is:
[tex]\begin{gathered} \frac{1}{2}+3\frac{5}{8} \\ =3+\frac{1}{2}+\frac{5}{8} \\ =3+\frac{9}{8}=3+1\frac{1}{8} \\ =4\frac{1}{8}\text{ cups} \end{gathered}[/tex]The answer is option B.