On a US nautical chart, the letter code 'M' annotated near an anchorage symbol indicates what bottom characteristic?

A. Marl
B. Mixed substrate
✓ MudCorrect
D. Manganese nodules

Why C is correct

Chart No. 1 bottom type codes use 'M' to denote mud. This information is used to assess holding ground quality when anchoring. (Light List — Bottom Type Codes)

Cited:Light List — Bottom Type Codes

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On a US nautical chart, the letter code 'M' annotated near an ancho… — USCG Exam Practice · CaptainsGround