Refer to the polymer scheme:  Further heating of the linear novolac with additional formaldehyde produces:
AJust water
BMore linear polymer
CCross-linked 3D thermosetting network = Bakelite
DAn alcohol
Answer & Solution
Correct answer: C. Cross-linked 3D thermosetting network = Bakelite
Linear novolac (acid-catalyzed condensation, low MW phenol-formaldehyde) + heat + extra HCHO → cross-linking through methylene bridges between para- and ortho- positions of adjacent phenol rings → rigid 3D network (Bakelite). Cannot remould (thermoset).
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