Consider the following code. 1 start = input('How old were you at the time of joining?') 2 now = input('How old are you today?') Which of the following statements will print the right output?

Question

Options

• Aprint( 'Congratulations on '
  • str(int(now) - int(start))
  • ' years of service!')
• Bprint( 'Congratulations on '
  • (int(now) - int(start))
  • ' years of service!')
• Cprint( 'Congratulations on '
  • str(now - start)
  • ' years of service!')
• Dprint( 'Congratulations on '
  • int(now - start)
  • ' years of service!')

• A
  74% (34)
• B
  7% (3)
• C
  15% (7)
• D
  4% (2)

Explanation

Option A is correct because input() always returns a string in Python, so both start and now are strings - you must convert them to int before subtracting (int(now) - int(start)), and then convert the resulting integer back to a str before concatenating it with the surrounding string literals using +.

Option B fails because it omits str() around the arithmetic result - Python raises a TypeError when you try to concatenate an int directly with a string using +.

Option C fails because it tries to subtract two raw strings (now - start), which Python cannot do - subtraction is not defined for strings and raises a TypeError.

Option D fails for the same reason as C (now - start errors on strings), and even if that were fixed, int(...) on the result still can't be concatenated with string literals without str().

Memory tip: Think of it as a round trip - input() gives you a string, you convert in with int() to do math, then convert out with str() to join it back into a sentence.

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