Final answer:
The correct identification of the sexual response cycle, as per the groundbreaking research of Masters and Johnson (1966), is Excitement, Plateau, Orgasm, and Resolution. Therefore, the correct option is 4.
Step-by-step explanation:
The four phases identified by Masters and Johnson's research revolutionised our understanding of the human sexual response. The Excitement phase, which is marked by heightened arousal and increased blood flow, is where the cycle starts.
The Plateau phase, in which arousal keeps rising, comes next. Orgasm, or the height of sexual pleasure and contractions of the muscles, is the third phase. The Resolution phase, which concludes, signifies the return to the resting state. The sexual response cycle's phases are shown in the correct order in Option 4.
Therefore, the correct option is 4.