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3x − 4 = 11 → 3x = 15 → x = 5. Option C is correct. DAT QR frequently tests linear equations solved in one or two steps.

Perimeter = 2(L + W) = 2(15 + 7) = 44. Thus Option C. DAT QR geometry problems often involve perimeter, area, and volume formulas.

B lymphocytes (B cells) are responsible for humoral immunity by differentiating into plasma cells that secrete antibodies (immunoglobulins). These antibodies bind to antigens, neutralize pathogens, and facilitate clearance by immune cells. Erythrocytes (Option A) transport oxygen and carbon dioxide but have no role in immunity. Platelets (Option B) participate in clotting, not antibody production. T helper cells (Option D) play a supportive role in immune activation by releasing cytokines but do not produce antibodies themselves. On the DAT, distinguishing humoral vs. cell-mediated immunity is crucial: B cells = antibodies; T cells = cytotoxic responses and immune regulation.

High saliva flow enhances buffering, cleansing, and remineralization, lowering risk. Options A, B, and D increase risk. DAT RC questions expect careful matching to the passage.

Hydrogen bonding between water molecules significantly raises boiling point relative to similar-size molecules. Dipole–dipole and dispersion forces are weaker. Ionic bonding is intramolecular, not relevant here. DAT chemistry emphasizes hydrogen bonding in water’s unique properties.