Waves P and Q have equal amplitudes. At point X, the waves arrive in phase and combine to produce a resultant wave of intensity $I$. The amplitude of wave P is then doubled. What is the intensity of the new resultant wave at X, expressed in terms of $I$?
- A$0.44I$
- B$1.5I$
- C$2.3I$
- D$3.0I$