Final answer:
The word formed from the root 'log' is 3) 'speech', as 'log' relates to words or dialogue. Examples include 'dialogue', 'monologue', 'prologue', and 'travelogue'.
Step-by-step explanation:
The word that can be formed from the root 'log' is 3)'speech'.
The root 'log' is derived from the Greek 'logos' meaning 'word', 'reason', or 'plan', and is commonly associated with speech or dialogue.
Thus, among the options provided, the most appropriate answer is 'speech'.
In English, there are multiple words that incorporate the root 'log', which relate to speaking, words, or studying.
For example, 'dialogue' means a conversation or discussion between two people ('dia-' meaning 'two').
'Monologue' refers to a long speech by one individual ('mono-' meaning 'one'). A 'prologue' is an introduction to a story or play ('pro-' meaning 'before'), and a 'travelogue' is a written or spoken account of one's travels.