Delta Company Has a Capital Structure of 20% Risky Debt

Delta Company has a capital structure of 20% risky debt with a beta of 0.9 and 80% equity with a beta of 1.7.Their current tax rate is 34%.What is the beta for Delta Company?

A) 0.59
B) 0.82
C) 1.06
D) 1.49
E) 1.54