A titration has been carried out between:
50 mL of HCl (concentration unknown)
0.2 M NaOH
Indicator: phenolphthalein (colorless in acid and pink in basic medium)
If 37.8 mL of 0.2 M NaOH has been used to fully neutralize (end-point) 50 mL of HCl, calculate the moles of HCl in 50 mL.

Hint: Write the balanced equation for HCl and NaOH and identify the reaction ratio between NaOH and HCl.
A. 0.01512 moles of HCl
B. 7.56 × 10⁻³ moles of HCl
C. 1.512 moles of HCl
D. 1.506 × 10⁻³ moles of HCl