Rationale
Pizza is better than hotdogs.
This sentence correctly uses the comparative form "better" to compare two items, pizza and hotdogs, while adhering to standard grammatical rules.
A) This sentence is grammatically correct as it appropriately uses the comparative form "better" to compare the two nouns, pizza and hotdogs. The structure follows the correct syntax for comparisons in English.
B) Although this sentence appears to convey a valid comparison, it is grammatically correct; however, it lacks the directness of the first choice. The comparison uses "more loving," which is acceptable, but "loving" is an adjective that can also be compared using "loving" without "more." Thus, while this option is grammatically acceptable, it is less direct than the correct answer.
C) This sentence incorrectly uses "then" instead of "than." The correct comparative form should be "taller than," indicating a comparison in height between Mandy and Jason. The use of "then" confuses the meaning, implying a time reference instead of a comparison.
D) Like option C, this sentence incorrectly uses "then" instead of "than." The phrase should state "the concert is happening then" to indicate timing, but in the context of comparison, it does not serve the intended purpose and is therefore grammatically incorrect.
Conclusion
Among the provided options, the sentence "Pizza is better than hotdogs" stands out as the only grammatically correct choice for making a comparison. The other sentences either contain errors or are less direct in their comparative structure. Understanding the proper use of "than" for comparisons is crucial for grammatical accuracy in English.