Correct answer: B. Normal backwardation

An inverted futures market is the same as backwardation:

• $F(0) < S(0)$, or
• a longer-maturity futures price is less than a shorter-maturity futures price.

So options A, C, and D all describe an inverted market.

Normal backwardation is different: it refers to the futures price being below the expected future spot price, i.e.:

$F(0) < E[S(t)]$

That does not define an inverted market. It describes the relationship to the expected spot price, not the shape of the futures curve.