Brace expansion produces the list 1 2 3 4 5 and attaches the prefix "Number_" to each element. The echo builtin then prints each resulting word, separating them with spaces. Therefore, the output is:
Number_1 Number_2 Number_3 Number_4 Number_5
The other options are incorrect because:
Bash always expands the brace expression unless it is quoted, so the literal string with braces will not appear.
Echo places a space between each argument, so the result is not a single concatenated word.
The range ends at 5, so no sixth value is produced.
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What is brace expansion in shell scripting?
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How does the echo command work in shell scripting?
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Why are there spaces in the output of echo Number_{1..5}?