Final answer:
The root words in the choices are 'cred', 'graph', and 'vis', which are used to form words like 'credible', 'autograph', and 'vision'. The other options 'anti', 'con', and 'post' are prefixes, not root words. The correct options are c, d, and f.
Step-by-step explanation:
The root words from the choices given are:
- Cred
- Graph
- Vis
A root word is the base part of a word, to which affixes can be added to create new words. For instance, 'cred' is a root word that means to believe, and when combined with other affixes, we get words like 'credible' and 'credit'. The root word 'graph' relates to writing or drawing, forming words such as 'autograph' and 'graphic'. Lastly, 'vis' is a root related to seeing, which can be seen in words like 'vision' and 'visualize'.
Prefixes and bases are often combined in English to alter or refine the meaning of the root word. The given options 'anti', 'con', and 'post' are all prefixes, not root words. 'Anti' means against, 'con' can signify with or thoroughly, and 'post' indicates after. These prefixes need to be attached to root words to convey a complete idea.
Therefore, the correct options are c, d, and f.