Option 1 -> Religious relates to faith or worship, not to something extraordinary in size or extent.
Option 2 -> Remarkable means extraordinary or worthy of attention, closely matching the meaning of prodigious.
Option 3 -> Repulsive means disgusting or offensive, which has no connection to prodigious.
Option 4 -> Spoilt means damaged or ruined, unrelated to the meaning of prodigious.
Hence, Option 2: Remarkable -> Prodigious means impressively great in extent, size, or degree, and remarkable captures this sense of being extraordinary or notably impressive -> correct