Final answer:
The philosophical perspective that considers mathematical sentences to be fundamentally syntactic is Formalism. It treats mathematics as a set of symbol manipulations based on rules, distinct from other philosophies like Platonism, Logicism, and Intuitionism which imbue mathematics with different degrees of inherent truth and mental processes.
Step-by-step explanation:
The philosophical perspective that asserts mathematical sentences are fundamentally syntactic and represent the study of formal systems without inherent philosophical presuppositions is D) Formalism. Formalism focuses on the structure and rules of mathematics as a formal language and is less concerned with the mathematical objects themselves, standing in contrast to other philosophies such as Platonism, Logicism, and Intuitionism.
Platonism holds that mathematical entities are real and exist independently of us. Logicism attempts to ground mathematics in logical derivation and principles. Intuitionism believes mathematics is a construct of the human mind and emphasizes the mental processes that underlie mathematical cognition. Formalism, however, strips mathematics of ontological commitments and views its statements as manipulations of symbols according to given rules.