Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions :
Scenario: Music Downloads and Streamed Movies
Phillip has an income of $300 per month,which he uses to purchase music downloads (MD) and streamed movies (SM) .Each music download costs $1 and each streamed movie costs $5.
-For some people,coffee and milk are perfect complements.Their indifference curves are:

A) right angles.
B) straight lines between the x and y axes.
C) straight lines out of the origin.
D) regular downward-sloping indifference curves,but their budget lines are right angles.