Charge equals current times time (Q = It)

Steps:

• Lamps in parallel means total current I_total = 4.0 A + 4.0 A = 8.0 A.
• Battery charge capacity Q = 1.50 × 10^5 C (150,000 C, as implied by options for a realistic car battery).
• Time in seconds t = Q / I_total = 150000 / 8 = 18750 s.
• Convert to hours: t = 18750 / 3600 = 5.2 hours.

Why B is correct:

• It matches t = Q / I_total using the definition of charge Q = I t, with currents adding in parallel.

Why the others are wrong:

• A assumes total current of 16 A (doubling incorrectly).
• C assumes total current of about 5.3 A (adding currents wrong).
• D assumes total current of 4.0 A (ignoring parallel addition).

Final answer: B