Final answer:
b. Soft focus is the technique used to create a sharp foreground and a blurry background, often used for glamourous close-up shots.
Step-by-step explanation:
The technique that describes the foreground being in sharp focus while the background appears diffuse or hazy is called b. soft focus.
Soft focus can be achieved by shooting slightly out of focus or using gauze or Vaseline to reduce the sharp definition of the film image. This technique is often used to create a glamorous effect, especially for close-up shots of the film's heroine.