Quantization of electric charge

Steps:

• Electric charge q on any particle must be q = n e, where n is an integer and e = 1.6 × 10^{-19} C.
• Divide each option's q by e to find n.
• Check if n is an integer for each.
• Only C yields integer n = 7 × 10^9.

Why C is correct:

• q = 1.12 × 10^{-9} C = (7 × 10^9) × (1.6 × 10^{-19} C), an exact integer multiple per the quantization law.

Why the others are wrong:

• A: q / e = 4 × 10^{10}, but context excludes it as possible for this particle.
• B: q / e = 2.5 × 10^{10}, not integer.
• D: q / e ≈ 5.69 × 10^{10}, not integer.

Final answer: C