Final answer:
President Joe Biden acted to restore national monument sizes to their original dimensions prior to the Trump administration. This decision was part of his broader ecological and cultural conservation efforts and reflects the historical trend of presidential powers expansion over time.
Step-by-step explanation:
Concerning the question of what action President Joe Biden has taken regarding national monument designations previously altered by President Trump, President Biden chose to guarantee that they will be enlarged again to their original size before President Trump took office. This move sought to reverse the reductions made by the Trump administration, which had scaled back certain national monuments, a decision that faced much controversy and legal challenges. President Biden's decision reflects his administration's commitment to environmental conservation and respect for cultural heritage sites.
Historically, presidents have utilized their position to expand the power of the presidency, as seen in various examples through history. For instance, George Washington expanded the power of the presidency significantly by appointing heads of various federal departments as his own advisors (Option B). These decisions and actions over time have paved the way for modern presidents to wield considerable influence over both domestic and foreign policy, including the designation or modification of national monuments.