Final answer:
The correct word using the appropriate prefix is 'invisible' where the prefix 'in-' means 'not able to be seen'. The other options present incorrect use of prefixes based on the sounds and spelling structures of the root words.
Step-by-step explanation:
The correct word that uses the appropriate prefix is B. invisible. The prefix 'in-' is often used to indicate negation or to make a word the opposite in meaning; in this case, it changes the word 'visible' to mean 'not able to be seen'. Prefixes such as 'im-', 'in-', 'il-', and 'ir-' are added to words based on the first letter of the root word to ensure the word is phonetically smooth, and in this case, 'invisible' follows this rule as the root word 'visible' starts with a consonant that pairs well with the 'in-' prefix.
Options A, C, and D are incorrect: 'imcomplete' should be 'incomplete', 'ilcapable' should be 'incapable', and 'inprobable' should be 'improbable'. Each prefix is selected to ensure the combination of the prefix and the root word sounds correct and maintains a smooth flow of pronunciation.