Concept:
White blood cells (WBCs) are classified into two groups:
• Granulocytes: Neutrophils, Eosinophils, Basophils
• Agranulocytes: Lymphocytes, Monocytes
Step 1: Classify the given cells.
• Basophils -- Granulocytes.
• Eosinophils -- Granulocytes.
• Lymphocytes -- Agranulocytes. \checkmark
• Neutrophils -- Granulocytes.
Step 2: Final conclusion.
Therefore, the agranulocyte among the given options is
\[
\boxed{\text{Lymphocytes}.}
\]