Can we draw the following hypothesis from the context (see options)? 

Context:

How to check engine vacuum hoses<br>Check each hose for bulges and swelling. If a hose feels soft or spongy when you touch it, this can indicate damage caused by your car's oil. [substeps] A swollen hose that is cracked and hard is often caused by heat damage.

Hypothesis: There are other substeps
Available choices:
 a). Yes;
 b). It's impossible to say;
 c). No;
b).