Answer:
an inference
Step-by-step explanation:
In English language, an inference can be defined as an act or process which typically involves a person deducing the meaning or message from something through induction.
Hence, the type of context clue that can be used to determine the meaning of "malleable" in the above sentence is inference.
Since the other materials were too hard to bend, it can be deduced by inference that the malleable materials are flexible, liable to bend through hammering and being extended.
This ultimately implies that, malleable materials can serve as springs to make Sarai's robot.