When two entities (person or things) are being compared then 'comparative degree' is used, here Tia's imaginary dog is compared with Larry's dog. Therefore, the use of 'smarter and stronger' is the right phrase for the blank.
The complete sentence is- 'Tia wanted a dog that was smarter and stronger than Larry's dog.'
Hence, option (c) is correct.
NOTE/-
· The Positive Degree is used to denote the mere existence of some quality of what we speak about. It is used when no comparison is made.
· The Comparative degree denotes a higher degree of quality than the positive and is used when two things are compared.
· The Superlative degree indicates the highest degree of quality and is used when more than two things (or sets of things) are compared.
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