Question

if______are present, then lubrication must be performed
a. steering knuckles
b. ball joints
c. stabilizer bar bushings
d. grease fittings

Explanation:

Lubrication is done to reduce friction and wear. Grease fittings are components that allow grease (a lubricant) to be added to parts. Steering knuckles, ball joints, and stabilizer bar bushings are parts that may have grease fittings. But the presence of grease fittings directly indicates that lubrication (adding grease through those fittings) must be performed.

Answer:

d. Grease fittings