Question

A) NO CHANGE B) commonplace, C) commonplace D) commonplace—

Short answer

The most appropriate replacement for the given sentence is option C (commonplace). The completed sentence will be: "The idea that exercise is important for health is a commonplace."

Step-by-step solution

Analyze the sentence and the given options

Read the sentence carefully and analyze the context. Look at the options and determine which one would be the most appropriate replacement for "#exercise#."

Compare the options

Compare the given options (A, B, C, and D) and see which one fits best in terms of context and grammar. A) NO CHANGE (This option leaves the sentence as is.) B) commonplace, (The comma seems unnecessary and may not be grammatically correct.) C) commonplace (This option replaces the word or phrase with 'commonplace.') D) commonplace— (This option uses an em dash, which may not be appropriate in this case.)

Choose the best replacement option

In this case, option C (commonplace) seems to be the most fitting option, as it fits within the context of the sentence and is grammatically correct.

Insert the chosen option

Replace the "#exercise#" placeholder with the chosen option (commonplace) to complete the sentence: "The idea that exercise is important for health is a commonplace."