Which is the BEST definition for the word strenuous as it is used in the excerpt from “To a Healthier Future”?

When it comes to strenuous outdoor activities, genetics do not have a greater influence, but people’s daily habits do.
Responses
A acquired
B effortless
C laborious
D healthy
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Which is the BEST definition for the word strenuous as it is used in the excerpt from “To a Healthier Future”?

When it comes to strenuous outdoor activities, genetics do not have a greater influence, but people’s daily habits do.
Responses
A acquiredacquired
B effortlesseffortless
C laboriouslaborious
D healthy

C - laborious

The word "strenuous" in this context implies that outdoor activities require a lot of effort and are physically demanding, making laborious the best definition.