Answer
P = 4.84 atm, the correct answer is (b)
Work Step by Step
$$P = hdg$$
$$P = hdg = (50.0 \ m )(1.00 \ g/cm^3)(9.80665 m/s^2) \times \frac{1 \ kg}{ 1000 \ g} \times (\frac{100 \ cm}{1 \ m})^3 \times \frac{1 \ atm}{101,325 \ Pa} = 4.84 \ atm$$
