Step 1: Identify anisole.
Anisole is methoxybenzene:
\[
C_6H_5OCH_3
\]
Step 2: Formation from phenol.
Phenol reacts with methyl halide in presence of base to form anisole via Williamson ether synthesis.
\[
C_6H_5OH + CH_3I \xrightarrow{NaOH} C_6H_5OCH_3
\]
Step 3: Name of reaction type.
Formation of ether from phenol is called etherification.
Final Answer:
\[
\boxed{\text{(B) etherification}}
\]