Concept:
Phrasal verbs have meanings that are different from the meanings of their individual words.
Step 1: Understand the context.
The sentence indicates that a marriage proposal was made and was not accepted.
Therefore, a phrasal verb meaning
reject is required.
Step 2: Examine the options.
• Turned away = sent away.
• Turned down = rejected.
• Turned against = became hostile toward.
• Turned back = returned.
Step 3: Select the appropriate phrasal verb.
The phrase
turned down means to refuse or reject an offer, request, invitation, or proposal.
Example:
• She turned down the job offer.
• He turned down the proposal.
Step 4: Conclusion.
The sentence becomes:
He approached her to marry him, but she turned down his proposal immediately.
Hence, option (B) is correct.