A part of the sentence below is highlighted. Choose the correct alternative from the options provided to replace the highlighted section and improve the sentence grammatically. If the sentence is already correct, select "No improvement needed".

It is not unusual for a tourist to choose a lodging destination sole over the presence of a swimming pool.

The correct alternative is solely over the presence of.

Step-by-step Explanation:

1. Analyzing the original sentence:
The original sentence reads: "It is not unusual for a tourist to choose a lodging destination sole over the presence of a swimming pool."

2. Identifying the grammatical error:
In the original highlighted part, the word "sole" is an adjective. However, here it modifies the prepositional phrase "over the presence of" / verb action of choosing, describing how or to what extent the choice is made (i.e., exclusively/only). Therefore, we need an adverb ("solely") rather than an adjective ("sole").

3. Evaluating the options:
- sole by the presence of: Incorrectly uses the adjective "sole" instead of the adverb "solely".
- No improvement needed: Incorrect because "sole" is grammatically wrong in this context.
- sole over the presences of: Incorrectly uses "sole" and uses the plural "presences" unnecessarily.
- solely over a presences of: Incorrectly pairs the singular article "a" with the plural noun "presences".
- solely over the presence of: Correctly uses the adverb "solely" to mean "only" or "exclusively", and maintains correct singular noun usage ("the presence of").

Thus, replacing the highlighted section with solely over the presence of makes the sentence grammatically correct.