This question already has an answer here:

How can I do layerstack in QGIS 2.16.2?

I do not find the option under the Raster>Miscellaneous>Merge options.

merged by PolyGeo Sep 14 '16 at 8:34

This question was merged with Layer stacking rasters in QGIS? because it is an exact duplicate of that question.

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