Choose the correctly written sentence. to be successful in any field, perseverance must be maintained. to achieve success in any field, one must persevere. to achieve success in any field, perseverance must be maintained.

The correctly written sentence is to achieve success in any field, one must persevere.

Explanation:

One of the important elements in the construction of a sentence is that it needs to have a subject agreement, these sentences are made of two parts together and in the sentence "To achieve success in any field, one must persevere." The subject for both parts is "One" and it is written using an infinitive structure to express purpose.

I appreciate that whoever she is, is smiling.

Explanation:

I would prefer that I knew why she was smiling, else ask her why, please.