The new drug proved to be highly efective,it has no side effects.

A. PROPERLY CONSTRUCTED SENTENCE
B. COMMA SPLICE
C. LACKS PARALLEL PARTS
D. HAS UNCLEAR PRONOUN

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A

Please check this site.

http://ace.acadiau.ca/english/grammar/comma.htm

This site provides information about comma splices and other grammar rules.

The correct answer is B) COMMA SPLICE.

A comma splice occurs when two independent clauses (complete sentences) are joined with just a comma, which is an incorrect way to combine two separate thoughts. In this case, the sentence "The new drug proved to be highly effective" and "it has no side effects" are two independent clauses that should be separated by a period or joined with a coordinating conjunction.

To correct the sentence, you can either use a period to create two separate sentences or use a coordinating conjunction such as "and" or "but" to join the clauses. Here are the corrected versions:

- The new drug proved to be highly effective. It has no side effects.
- The new drug proved to be highly effective, and it has no side effects.

Based on the information provided, the correct answer is A. PROPERLY CONSTRUCTED SENTENCE.

Explanation:
The sentence "The new drug proved to be highly effective, it has no side effects" is a properly constructed sentence because it follows the rules of grammar and punctuation. The subject ("The new drug") is followed by the verb ("proved"), and the sentence is complete with a subject, verb, and object. There are no grammatical errors or punctuation mistakes in this sentence.

The sentence does not contain a comma splice because there is no comma incorrectly connecting two independent clauses. A comma splice occurs when a comma is used to connect two complete sentences without using a coordinating conjunction.

The sentence does not lack parallel parts because there are no elements in the sentence that need to be parallel. Parallelism is the use of consistent grammatical structures in a sentence, such as using the same verb tense or form for multiple items in a list.

The sentence does not have an unclear pronoun because the pronoun "it" is referring clearly to the subject of the sentence, which is "The new drug."