Based on ROA and ROE ratios only (see table below), which company offers the best opportunity to an investor.

Explain.

Imperial Oil Ltd Exxon Mobil Corp Oil & Gas Industry Return on Assets 2015-12-31 2016-12-31 2017-12-31 2018-12-31 2019-12-31 2.65% 5.27% 1.18% 5.62% 5.28% 4.71% 2.35% 5.81% 6.00% 4.05% 3.40% -0.20% 5.30% 4.70% 2.79% Imperial Oil Ltd Exxon Mobil Corp Oil & Gas Industry Return on Equity 2015-12-31 2016-12-31 2017-12-31 2018-12-31 2019-12-31 4.85% 9.23% 1.99% 9.55% 9.07% 9.36% 4.64% 11.10% 10.98% 7.48% 7.90% -0.60% 10.50% 9.00% 5.33%