Which sentence uses correct parallel construction?
a. you can either talk to the manager about your problem or writing a letter to the president of the company.
b. anyone who is going to work here will have to be athletic, an intelligent person, and have a good sense of humor.
c. most people enjoy ice cream and the plant grows.
d. the painter wore glasses, gloves, and boots.

a. You can either talk to the manager about your problem or writing a letter to the president of the company.

- here the correct form would be "or write a letter" - so the whole sentence is incorrect

b. Anyone who is going to work here will have to be athletic, an intelligent person, and have a good sense of humor.

- yes, this one is correct! it doesn't have any mistakes AND it's a parallel construction.

c. Most people enjoy ice cream and the plant grows. - this is not incorrect, but it's a bit weird. plus, it's not a parallel construction

d. The painter wore glasses, gloves, and boots.  - this is correct, but it's not a parallel construction.

Allusion and illusion. an allusion is an indirect reference, whereas an illusion is something that is unreal or incorrect. each of the nouns has a related verb form: allude “to refer indirectly to,” and illude (not a very common word), which may mean “to delude or deceive” or “to subject to an illusion.”