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Cisco Certified Network Associate (CCNA) · Cisco
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
The port must be configured as trunk or access; an interface in the default mode (dynamic auto) cannot be configured as a secure port. https://www.cisco.com/en/US/docs/switches/lan/catalyst3850/software/release/3.2_0_se/multibook/configuration_guide/b_consolidated_config_guide_3850_chapter_011111.html
why is b wrong?
Probably because the question specifically asked that only PC1 gets to use that port. Not that answer B couldn't serve the same purpose, but for the sake of specificity, go with C.