Solution:
The sentence states that father cannot come back now because he is working. We need to find a picture that depicts someone working.
Analysis of Pictures:
- Picture A: Shows people indoors, possibly working at desks or in an office environment.
- Picture B: Shows people outdoors, enjoying a view.
- Picture C: Shows people playing soccer.
- Picture D: Shows a person playing basketball.
- Picture E: Shows a snowy outdoor scene.
- Picture F: Shows kittens.
Picture A shows people in what appears to be a work setting, which aligns with the sentence 'he is working'.
Answer: A