Given a variable str initialized as "Hello World", what will str.length() return?

The length method returns the total number of characters in the string, including letters, spaces, punctuation, and any other characters. In the string "Hello World", there are 11 characters:

• "H" (1)
• "e" (2)
• "l" (3)
• "l" (4)
• "o" (5)
• " " (the space counts as one character, 6)
• "W" (7)
• "o" (8)
• "r" (9)
• "l" (10)
• "d" (11)

When counting all characters together, the total comes to 11. Therefore, str.length() will correctly return 11.

Other options fail to account for the correct counting of all characters in the string. For example, option B would suggest that there are only 10 characters and would likely have omitted the space. Options C and D both overestimate the character count, which also demonstrates misunderstanding of how length is calculated in this context.