Question

hes also acclaimed for product designs and art installations: knobby furniture, sheets that change color under body heat, flexible glass tile panels, and wallcoverings printed with enigmatic interlocked numbers. source: businessweek in this sentence, enigmatic means: made less hopeful or enthusiastic having unlimited power not clear to the understanding loaded to excess or impeded by a heavy load

Explanation:

The word "enigmatic" is an adjective. Looking at the context of the sentence, it describes "interlocked numbers" on wallcoverings. The other options don't fit the context. "Made less hopeful or enthusiastic" is about emotions (not relevant here). "Having unlimited power" is about power (not related to numbers on wallcoverings). "Loaded to excess or impeded by a heavy load" is about weight or burden (not relevant). "Not clear to the understanding" makes sense as "enigmatic" often means mysterious or hard - to - understand, which fits the description of the numbers on the wallcoverings.

Answer:

not clear to the understanding