Concept:The word "profusely" means pouring out freely or in huge quantities.
Explanation:The underlined word "profusely" refers to something done in very large amounts.
For example, "bleeding profusely" means losing a lot of blood.
Now let us check the options.
"Slowly" means at a low speed, which is not the intended meaning.
"Excessively" means more than necessary, which goes beyond the original sense.
"Extremely" means to a very high degree, but it does not capture the idea of quantity.
"Abundantly" means in great supply or in large amounts.
This exactly matches the meaning of "profusely".
Answer:D. abundantly