please help

1) A bond in the top four bond ratings is known as a(n) __________.

• High-yield bond
• Investment-grade bond
• Junk bond
• Speculative bond

2)

What type of bond is typically used as a benchmark bond?

• Investment-grade bond
• Speculative bond
• Highly speculative bond
• Treasury bond

3)

The economic theory that bonds with different maturities are perfect substitutes is known as ___________.

• The expectations hypothesis
• The default hypothesis
• The bond hypothesis
• The inverse yield hypothesis