Step 1: Identify the task.
We must name the type of Sandhi present in the word chinmay.
Step 2: Recall Sandhi types.
Sandhi is the fusion of sounds at a junction; when consonants merge or change, it is Vyanjan Sandhi.
Step 3: Split the word.
chinmay breaks into chit plus may.
Step 4: Watch the meeting point.
The dental t at the end of chit meets the nasal m of may.
Step 5: Apply the rule.
A dental t before a nasal becomes its own class nasal n, so chit plus may turns into chinmay.
Step 6: Classify and conclude.
Since this change is between consonants, it is Vyanjan Sandhi, option B.
\[ \boxed{\text{B. Vyanjan Sandhi}} \]