Barmer prints are known for their bold geometric patterns called:

Concept: Rajasthan's hand-block printing traditions are named after distinct geographic centres, and each centre is identified by a signature motif style, colour palette, and production technique rather than by one shared method. Recognising a print therefore means matching its described visual character (motif type, colour scheme, region of origin) to the specific town or district it comes from.

1. Identify the region named in the question: Barmer district, in western Rajasthan near the Thar Desert.

2. Match the described visual character: "bold geometric patterns" — large, symmetrical, angular motifs (stars, diamonds, trellis grids) rather than delicate floral sprays.

3. Recall which Rajasthani print tradition is centred on bold geometric, trellis-like motifs printed mainly in deep indigo and madder-red on a resist base: Ajrakh printing, historically brought via Sindh trade routes and practised in Barmer (as well as in Kutch, Gujarat).

4. Conclude: the print associated with Barmer's bold geometric patterns is the Ajrakh print.

Cross-check: The other three named prints are each tied to a different town near Jaipur and a different motif character — Bagru to natural-dye block printing with curvilinear floral and paisley motifs, Sanganeri to fine floral sprays on a light ground, and Dabu to the mud-resist technique used to create those motifs — none of which is the bold geometric style specifically linked to Barmer, confirming Ajrakh print as the answer.